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Go Math Grade 1 Chapter 3 Answer Key Pdf: Students of First Grade can keep a track of their preparation level using the Go Math Grade 1 Answer Key Chapter 3 Addition Strategies. By Solving Problems from the Go Math Grade 1 Ch 3 Answers you can enhance your fundamentals both at Chapter Level and Lesson Level. The HMH Go Math Grade 1 Answer Key Chapter 3 Addition Strategies covers questions belonging to Lessons, Assessments, Homework & Practice, Review Tests, etc. You can download the First Grade Go Math Chapter 3 Answer Key and access the preparation material no matter whichever corner you are preparing.

Addition Strategies Go Math Grade 1 Chapter 3 Answer Key Pdf

To become proficient in the Concepts of Go Math Grade 1 Chapter 3 Addition Strategies all you need to do is be thorough with the concepts and solve the various questions from it. Access the Topicwise HMH Go Math Grade 1 Ch 3 Addition Strategies Solution Key by simply clicking on the direct links available. Enhance your conceptual knowledge taking the help of these quick resources and become a pro in the subject.

Addition Strategies

• Addition Strategies Show What You Know – Page 128
• Addition Strategies Vocabulary Builder – Page 129
• Addition Strategies Game: Ducky Sums – Page 130
• Addition Strategies Vocabulary Game – Page(130A-130B) 

Lesson: 1 Algebra • Add in Any Order

• Lesson 3.1 Algebra • Add in Any Order – Page(131-136)
• Algebra • Add in Any Order Homework & Practice 3.1 – Page(135-136)

Lesson: 2 Count On

• Lesson 3.2 Count On – Page(137-142)
• Count On Homework & Practice 3.2 – Page(141-142)

Lesson: 3 Add Doubles

• Lesson 3.3 Add Doubles – Page(143-148)
• Add Doubles Homework & Practice 3.3 – Page(147-148)

Lesson: 4 Use Doubles to Add

• Lesson 3.4 Use Doubles to Add -Page(149-154)
• Use Doubles to Add Homework & Practice 3.4 – Page(153-154)

Lesson: 5 Doubles Plus 1 and Doubles Minus 1

• Lesson 3.5 Doubles Plus 1 and Doubles Minus 1 – Page(155-160)
• Doubles Plus 1 and Doubles Minus 1 Homework & Practice 3.5 – Page(159-160)

Lesson: 6 Practice the Strategies

• Lesson 3.6 Practice the Strategies – Page(161-166)
• Practice the Strategies Homework & Practice 3.6 – Page(165-166)

Mid-Chapter Checkpoint

• Addition Strategies Mid-Chapter Checkpoint – Page 164

Lesson: 7 Add 10 and More

• Lesson 3.7 Add 10 and More – Page(167-172)
• Add 10 and More Homework & Practice 3.7 – Page(171-172)

Lesson: 8 Make a 10 to Add

• Lesson 3.8 Make a 10 to Add – Page(173-178)
• Make a 10 to Add Homework & Practice 3.8 – Page(177-178)

Lesson: 9 Use Make a 10 to Add

• Lesson 3.9 Use Make a 10 to Add – Page(179-184)
• Use Make a 10 to Add Homework & Practice 3.9 – Page(183-184)

Lesson: 10 Algebra • Add 3 Numbers

• Lesson 3.10 Algebra • Add 3 Numbers – Page(185-190)
• Algebra • Add 3 Numbers Homework & Practice 3.10 – Page(189-190)

Lesson: 11 Algebra • Add 3 Numbers

• Lesson 3.11 Algebra • Add 3 Numbers – Page(191-196)
• Algebra • Add 3 Numbers Homework & practice 3.11 – Page(195-196)

Lesson: 12 Problem Solving • Use Addition Strategies

• Lesson 3.12 Problem Solving • Use Addition Strategies – Page(197-202)
• Problem Solving • Use Addition Strategies Homework & Practice 3.12 – Page(201-202)
• Addition Strategies Chapter 3 Review/Test – Page(203-206)

Curious George

There are 4 fish in the tank. If you doubled the number of fish, how many would there be?

Addition Strategies Show What You Know

Model Addition

Use to show each number. Draw the cubes. Write how many in all.

Question 1.

Answer:

2         +           3         =                 5

+ =

Therefore, there are 5 in total

Use Symbols to Add
Use the picture. Write the addition sentence.

Question 2.

Answer: 2 + 4 = 6

Explanation:

The number of red bugs =  2

The number of green bugs = 4

Total : 2 + 4 = 6

Therefore, the total number of bug pictures are 6.

Question 3.

Answer: 4

Explanation:

The number of purple butterflies = 3

The number of orange butterflies = 1

Total butterflies : 3 + 1 = 4

Therefore, there are 4 butterflies

Add in Any Order

Use and to add. Color to match. Write each sum.

Question 4.

1 + 4 = __

Answer:

+ =

Total : 1 + 4 = 5

Question 5.

4 + 1 = ___

Answer:

+ =

Total : 4 + 1 = 5

Addition Strategies Vocabulary Builder

Visualize It
Write the addends and the sum for the addition sentence

Answer:

Understand Vocabulary
Use a review word to complete the sentence.

Question 1.
4 and 3 in 4 + 3 = 7 are ___

Answer:

In 4 + 3 = 7 , 4 and 3 are addends.

Question 2.
4 + 3 = 7 is an ___

Answer:

4 + 3 = 7 is an Addition sentence.

Question 3.
4 cubes and 3 cubes are put together to __ the groups.

Answer:

4 cubes and 3 cubes are put together to 7 the groups.

Addition Strategies Game: Ducky Sums

Ducky Sums

Materials

Play with a partner.
1. Put your on START.
2. Toss the . Move your that number of spaces.
3. Use a a , and a to make the spinner. Spin.
4. Add the number you spin and the number your is on. Your partner checks the sum.
5. Take turns. The winner is the first person to get to END.

Addition Strategies Vocabulary Game

Going Places with GOMATH! words

Concentration

Materials
2 sets of word cards
How to Play
Play with a partner.

1. Mix the cards. Put the cards in rows blank side up.
2. Turn over two cards.
   • If the words match, keep the pair of cards.
   • If the words do not match, turn the cards blank side up again.
3. The other player takes a turn.
4. Find all the pairs. The player with more pairs wins.

The Write Way

Reflect
Choose one idea. Draw and write about it.
• Mary writes the addition sentence 4 + 5.
Rose writes the addition sentence 5 + 4.
Will they get the same answer? Tell how you know.
• Think about the ways you learned to add. Tell about your favorite way to add. Explain why.

Lesson 3.1 Algebra • Add in Any Order

Essential Question
What happens if you change the order of the addends when you add?

Listen and Draw

Use and . Color to model the problem. Write the addition sentence.

Answer:
Addition sentence :
7 + 8 = 15

+

=

=   1               2            3            4              5             6             7            8           9           10          11         12        13           14          15

Use and . Color to change the order. Write the addition sentence.

Answer:
Addition sentence ( changing the order )  :
8 + 7 = 15

+ =

= 1               2            3            4              5             6             7            8           9           10          11         12        13           14          15

Math Talk
MATHEMATICAL PRACTICES

Describe how knowing the fact 7 + 8 helps you find 8 + 7.

Model and Draw

Answer:
5 + 6 = 11
Fact : Even after changing the order of addends , the sum is same .

Share and Show MATH BOARD

Add. Change the order of the addends. Add again.

Question 1.

Answer:
8 + 9 = 17
Addition sentence after changing the order of addends =
9 + 8 = 17

Go Math Workbook Grade 1 Topic 3 Lesson 3.1 Answer Key Question 2.

Answer:
6 + 7 = 1 3
Addition sentence after changing the order of addends =
7 + 6 = 13

Question 3.

Answer:
7 + 5 = 12
Addition sentence after changing the order of addends =
5 + 7 = 12

Question 4.

Answer:
2 + 8 = 10
Addition sentence after changing the order of addends =
8 + 2 = 10

Question 5.

Answer:
9 + 2 = 11
Addition sentence after changing the order of addends =
2 + 9 = 11

Question 6.

Answer:
8 + 4 = 12
Addition sentence after changing the order of addends =
4 + 8 = 12

On Your Own

MATHEMATICAL PRACTICE
Attend to Precision Add. Change the order of the addends. Add again.

Question 7.

Answer:
9 + 6 = 15
Addition sentence after changing the order of addends =
6 + 9 = 15

Question 8.

Answer: 0 + 6 = 6
Addition sentence after changing the order of addends =
6 + 0 = 6

Question 9.

Answer:
8 + 3 = 11
Addition sentence after changing the order of addends =
3 + 8 = 11

Question 10.

Answer:
5 + 9 = 14
Addition sentence after changing the order of addends =
9 + 5 = 14

Question 11.

Answer:
4 +5 = 9
Addition sentence after changing the order of addends =
5 + 4 = 9

Question 12.

Answer:
8 + 5 = 13
Addition sentence after changing the order of addends =
5 + 8 = 13

Question 13.
THINK SMARTER
Nina uses the number sentence 3 + 7 = 10 to tell about her toy trucks. What other number sentence could Nina write to tell about her trucks using the same addends?
__ = __ + __

Answer:
Given,
Addition sentence : 3 + 7 = 10
Other Addition sentence : 10 = 7 + 3

Question 14.
GO DEEPER
Explain If Adam knows 4 + 7 = 11, what other addition fact does he know? Write the new fact in the box. Tell how Adam knows the new fact.

________________________
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
________________________

Answer:
Given ,
Addition sentence = 4 + 7 = 11
Other addition fact : 7 + 5 = 11

Problem Solving • Applications WRITE Math

Write two additional sentences you can use to solve the problem. Write the answer.

Question 15.
Roy sees 4 big fish and 9 small fish. How many fish does Roy see?
__ fish
__ + __ = __
__ + __ = __

Answer: 13

Explanation:
Given,
Number of big fishes = 4
Number of small fishes = 9
Total number of fishes = 4 + 9 = 13
Therefore, Roy sees 13 fishes
Addition sentences:
4 + 9 = 1 3
9 + 3 = 13

Question 16.
THINK SMARTER
Justin has 6 toys. He gets 8 more toys. How many toys does he have now?
__ toys
__ + __ = __
__ + __ = __

Answer: 14

Explanation:
Given,
Justin has 6 toys.
Number of toys he gets more = 8
Total : 6 + 8 = 14
Therefore, the total number of toys = 14
Addition sentences:
6 + 8 = 14
8 + 6 = 14

Question 17.
THINK SMARTER
Anna has two groups of pennies. She has 10 pennies in all. When she changes the order of the addends, the addition sentence is the same. What sentence can Anna write?

__ = __ + __

Answer: 5 + 5 = 10

Explanation :
Given,
Anna has 2 groups of pennies and also total number of pennies = 10
The addition sentence can be written with same addends as
5 + 5 = 10

Question 18.
THINK SMARTER
Write the addends in a different order.
3 + 4 = 7
__ + __ = 7

Answer:
4 + 3 = 7

TAKE HOME ACTIVITY
• Ask your child to explain what happens to the sum when you change the order of the addends.

Algebra • Add in Any Order Homework & Practice 3.1

Add. Change the order of the addends. Add again.

Question 1.

Answer:
7 + 3 =10
3 + 7 = 10

Question 2.

Answer:
4 + 7 = 11
7 + 4 = 11

Question 3.

Answer:
9 + 8 = 17
8 + 9 = 17

Problem Solving

Write two additional sentences you can use to solve the problem.

Question 4.
Camila has 5 shells. Then she finds 4 more shells. How many shells does she have now?
__ + __ = __
__ + __ = __

Answer: 9

Explanation :
Given that,
The number of shells Camila have = 5
The number of shells she finds more = 4
Total: 5+4= 9
Therefore, the number of shells she have now = 9
Addition sentences :
5 + 4 = 9
4 + 5 = 9

Question 5.
WRITE Math
Use pictures or words to explain how you would use the sum of 13 to show how to add in any order.

13 can be shown as the sum of 6 and 7
6 + 7 = 13

+

=

Lesson Check

Question 1.
What is another way to write 7 + 6 = 13?
6 + 7 = __

Answer: 6 + 7 = 13

Grade 1 Go Math Chapter 3 Lesson 1 Answer Key Question 2.
What is another way to write 6 + 8 = 14?
8 + 6 = __

Answer: 8 + 6 = 14

Spiral Review

Question 3.
What is the sum? Write the number.

Answer: 4 + 3 = 7

Question 4.
How many nests are there? Write the number.
2 nests and 1 more nest __ nests

Answer: 3

Explanation : 2 + 1 = 3
Therefore, the total number of nests = 3

Lesson 3.2 Count On

Essential Question
How do you count on 1, 2, or 3?

Listen

Start at 9. How can you count on to add? Add 1.

Add 1.  9 + 1 =10
Add 2.  9 + 2 = 11
Add 3.  9 + 3 = 12

Math Talk
MATHEMATICAL PRACTICES
Analyze How is counting on 2 like adding 2?

Share and Show MATH BOARD

Circle the greater addend. Draw to count on 1, 2, or 3. Write the sum.

Question 1.

Answer:
Greater addend : 6
6 + 2 = 8

 

Question 2.

6 + 3 = __

Answer:
Greater addend : 6
6 + 3 = 9

Go Math Grade 1 Chapter 3 Lesson 3.2 Answer Key Question 3.

__ = 1 + 6

Answer:
Greater addend = 6
6 + 1 = 7

Question 4.

__ = 7 + 1

Answer:
Greater addend  : 7
7 + 1 = 8

Question 5.

2 + 7 = __

Answer:
Greater addend = 7
7 + 2 = 9

Question 6.

__ = 7 + 3

Answer:
Greater addend : 7
7 + 3 = 10

On Your Own

MATHEMATICAL PRACTICE
Circle the greater addend. Count on to find the sum.

Question 7.

Answer:
Greater addend : 9
1 + 9 = 10

Question 8.

Answer:
Greater addend  : 8
3 + 8 = 11

Question 9.

Answer:
Greater addend : 8
1 + 8 = 9

Question 10.

Answer:
Greater addend : 6
1 + 6 = 7

Question 11.

Answer :
Greater addend : 9
9 + 3 =12

Question 12.

Answer:
Greater addend : 7
7 + 2 = 9

Question 13.

Answer:
Greater addend : 6
2 + 6 = 8

Question 14.

Answer:
Greater addend : 5 + 3 = 8

Question 15.

Answer:
Greater addend : 7
7 + 1 = 8

Question 16.

Answer:
Greater addend = 7
3 + 7 =10

Question 17.

Answer:
Greater addend : 9
9 + 2 = 11

Question 18.

Answer:
Greater addend : 4
3 + 4 = 7

Question 19.
GO DEEPER
Adam has 6 hats. Molly has 3 hats. They stack all their hats. Then Blake puts 2 more hats on the stack. How many hats are on the stack?
__ + __ = ___ hats
__ + __ = ___ hats

Answer:
6 + 3 = 9
9 + 2 = 11

Question 20.
MATHEMATICAL PRACTICE
Explain Terry added 3 and 7. He got a sum of 9. His answer is not correct. Describe how Terry can find the correct sum.
_______________
_ _ _ _ _ _ _ _ _ _ _
_______________
_______________
_ _ _ _ _ _ _ _ _ _ _
_______________

Answer:
No, he is wrong.
The sum of 3 and 7 is 10
Addition sentence :  3 + 7 = 10
Starts at 7 and counts by 3, means 8, 9, 10
So, the answer is 0.

Problem Solving • Applications WRITE Math

Draw to solve. Write the addition sentence.

Question 21.
THINK SMARTER
Cindy and Joe pick 8 oranges. Then they pick 3 more oranges. How many oranges do they pick?
__ + __ = ___ oranges

Answer: 11

Explanation :
Given that,
The number of oranges Cindy and Joe pick = 8
The number of  more oranges they pick = 3
Total : 8 + 3 = 11 oranges
Therefore, the number of total oranges = 11

+     

________________________________________________________________________________________________________

=

1                  2                3                 4                5              6                  7                  8               9               10              11

Which three numbers can you use to complete the problem?

Question 22.
THINK SMARTER
Jennifer has __ stamps. She gets __ more stamps. How many stamps does she have now?
__ + __ = __ stamps

Answer: 10

Explanation :
Jennifer has  7 stamps
Number of more stamps = 3
Addition sentence :
7 + 3 = 10

Question 23.
THINK SMARTER
Count on from 3. Write the number that shows 2 more in the box below

Answer: 5

TAKE HOME ACTIVITY
• Have your child tell you how to count on to find the sum for 6 + 3.

Count On Homework & Practice 3.2

Circle the greater addend. Count on to find the sum.

Question 1.

Answer:
Greater addend : 8
8 + 2 = 10

Question 2.

Answer:
Greater addend : 7
1 + 7 = 8

Question 3.

Answer:
Greater addend : 9
3 + 9 = 12

Question 4.

Answer:
Greater addend : 5
5 + 3 = 8

Problem Solving

Draw to solve. Write the addition sentence.

Go Math 1 Circle The Greater Addend Count on to Find the Sum Question 5.
Jon eats 6 crackers. Then he eats 3 more crackers. How many crackers does he eat?
__ + __ = __ crackers

Answer:  9

Explanation :
Number of crackers Jon eat = 6
Number of crackers he ate more = 3
Total : 6 + 3 = 9 Crackers
Therefore, Jon ate 9 crackers .

Question 6.
WRITE Math
Use pictures or words to explain how you can find 9 + 3 by counting on.

Answer:
9 + 3 = 12

  +  =

1      2      3        4      5       6      7       8     9              10     11    12       

Lesson Check

Question 1.
Count on to solve 5 + 2. Write the sum
__

Answer:
5 + 2 = 7

Question 2.
Count on to solve 1 + 9. Write the sum.
__

Answer:
1 + 9 = 10

Spiral Review

Question 3.
What does the model show?
__ + __ = ___

Answer:
3 + 3 = 6

+ =

Question 4.
4 ducks swim in the pond. 2 more ducks join them. How many ducks are in the pond now? Complete the model and the number sentence.

4 + 2 = __

Answer:
4 + 2 = 6

Lesson 3.3 Add Doubles

Essential Question
What are doubles facts?

Listen and Draw

Use . Draw to solve. Write the addition sentence.

__ + __ = __

Answer: 2 + 2 = 4

+ =

Math Talk
MATHEMATICAL PRACTICES
Use Tools Describe how your model shows a doubles fact.

Model and Draw

Why are these double facts?

Answer:                                                             Answer:

1 + 1 = 2                                                           2 + 2 = 4

+ =                                         +    =

Share and Show MATH BOARD

Use . Draw to show your work. Write the sum.

Question 1.

Answer:
3 + 3 = 6

+

_____________________________

=

Go Math Grade 1 Lesson 3.3 Answer Key Question 2.

Answer: 4 + 4 = 8

+

___________________________

=

Question 3.

Answer: 5 + 5 = 10

+ 

_______________________________________________

Question 4.

Answer: 6 + 6 = 12

+ 

____________________________________________________________________________

=

On Your Own

GO DEEPER
Use . Draw to show your work. Write the sum.

Question 5.

Answer: 7 + 7 = 14

+   

______________________________________________________________________________

=

Go Math Grade 1 Chapter 3 Lesson 3.3 Answer Key Question 6.

Answer: 8 + 8 = 16

+   

________________________________________________________________________

= 

Question 7.
MATHEMATICAL PRACTICE
Look for a Pattern Look back at Exercises 1 – 6. Write the fact that would be next in the pattern. Draw to show your work.

Add.

Question 8.

Answer: 5 + 5 = 10

+

________________________________________________________________

=

Question 9.

Answer: 7 + 7 = 14

+   

______________________________________________________________________________

=

Algebra Make A Ten to Add Lesson 3.3 Answer Key Question 10.

Answer: 6 + 6 = 12

+ 

____________________________________________________________________________

=

Question 11.

Answer: 10 + 10 = 20

  +   =

           

Question 12.

Answer: 4 + 4 = 8

+

___________________________

=

Question 13.

Answer: 8 + 8 = 16

+   

________________________________________________________________________

= 

Problem Solving • Applications WRITE Math

Write a doubles fact to solve.

Question 14.
THINK SMARTER
Meg and Paul each put 8 apples into a basket. How many apples are in the basket?
__ + ___ = __ apples

Answer : 16

Explanation :
The number of apples meg kept in a basket = 8
The number of apples Paul kept in a basket = 8
Total : 8 + 8 = 16 apples
Therefore, total number of apples in the basket = 16

Question 15.
THINK SMARTER
There are 18 people at the party. Some are boys and some are girls. The number of boys is the same as the number of girls.
__ = __ + __

Answer : 9 + 9 = 18

Explanation :
Given,
Total number of people in the party = 18
Also given , The number of boys is the same as the number of girls.
So, 9 + 9 = 18.

Question 16.
THINK SMARTER
The cubes show a doubles fact. Choose the doubles fact and the sum.

Answer:
The number sentence with doubles fact = 4 + 4 = 8

TAKE HOME ACTIVITY
• Have your child choose a number from 1 to 10 and use that number in a doubles fact. Repeat with other numbers.

Add Doubles Homework & Practice 3.3

Use . Draw to show your work. Write the sum.

Question 1.

Answer: 4 + 4 = 8

+ =

Question 2.

Answer: 6 + 6 = 12

+ =

Question 3.

Answer: 3 + 3 = 6

+ =

Question 4.

Answer: 8 + 8 = 16

  +  =                                                                                                                                                                                        

Problem Solving

Write a doubles fact to solve.

Go Math Grade 1 Pdf Lesson 3.3 Eat It or Toss It Answer Key Question 5.
There are 16 crayons in the box. Some are green and some are red. The number of green crayons is the same as the number of red crayons.
__ = __ + __

Answer: 16 = 8 + 8

Explanation:

Given ,
The total number of crayons in the box = 16
Also give, the number of green crayons is the same as the number of red crayons.
Now, By using doubles fact we can write number sentence as:
8 + 8 = 16

Question 6.
WRITE Math
Use pictures or words to explain how you could find the sum of 7 + 7.

Answer:
7 + 7 = 14

+ =

Lesson Check

Question 1.
Write a doubles fact with the sum of 18.
__ + __ = 18

Answer:
A doubles fact with the sum of 18 =
9 + 9 = 18

Question 2.
Write a doubles fact with the sum of 12.
__ + __ = 12

Answer:
A doubles fact with the sum of 12 =
6 + 6 = 12

Spiral Review

Question 3.
What is the sum of 3 and 2? Draw the . Write the sum.
__+ __ = __

Answer: 5

Explanation:
The sum of 3 and 2 is 5
Number sentence :
3 + 2 = 5

+ =

Question 4.
Draw circles to show the numbers. Write the sum.
__ + __ = __

Answer:

Lesson 3.4 Use Doubles to Add

Essential Question
How can you use doubles to help you add?

Listen and Draw

Draw to show the problem. Write the number of fish.

There are __ fish.

Math Talk
MATHEMATICAL PRACTICES

Look for Structure How does knowing 3 + 3 help you solve the problem?

Model and Draw

How can a doubles fact help you solve 6 + 7?

So, 6 + 7 = __

Answer:
6 + 7 =  13
By using doubles fact ,
13 can be shown as 6 + 6 + 1 = 13

Share and Show MATH BOARD

Use to model. Make doubles. Add.

Question 1.

Answer :
9 + 8 = 17
8 + 8 + 1 = 17
So, 9 + 8 = 17

Question 2.

Answer:
5 + 5 + 1 = 11
So, 5 + 6 = 11

On Your Own

MATHEMATICAL PRACTICE
Use a Concrete Model
Use . Make doubles. Add.

Question 3.

Answer:
7 + 8 = 15
By using doubles fact ,
7 + 7 + 1 = 15

Question 4.

Answer :
5 + 4 = 9
By using doubles fact ,
4 + 4 + 1 = 9

Question 5.
THINK SMARTER
Mandy has the same number of red and yellow leaves. Then she finds one more yellow leaf. There are 17 leaves in all. How many leaves are red? How many leaves are yellow?
__ red leaves __ yellow leaves

Answer :  17

Explanation :
Given , the total number of leaves = 17
Also given , Mandy has the same number of red and yellow leaves
And also find another yellow flower
By using doubles plus one effect , we can show addition sentence as :
8 + 8 + 1 = 17
Therefore,
Number of red flowers = 8
Number of yellow flowers = 9.

GO DEEPER
Explain Would you use count on or doubles to solve? Why?

Question 6.
3 + 4

Answer: 3 + 3 + 1 = 7
Doubles plus one fact.

Question 7.
3 + 9

Answer :
9 and count on 3

Problem Solving • Applications

Question 8.
THINK SMARTER
Use what you know about doubles to complete the Key. Write the missing sums.

Answer :

Question 9.
THINK SMARTER
There are 7 red cubes. There are 8 yellow cubes. How many cubes are there in all? Use a double to add. Write the missing numbers.

Answer: 15

Explanation:
The number of red cubes = 7
The number of yellow cubes = 8
Total : 7 + 8 = 15
Number sentence with double fact = 7 + 7+ 1 = 15
So, 7 + 8 = 15

TAKE HOME ACTIVITY
• Ask your child to show you how to use what he or she knows about doubles to help solve 6 + 5.

Use Doubles to Add Homework & Practice 3.4

Use . Make doubles. Add.

Question 1.

Answer:
5 + 6 = 11
The number sentence with doubles fact =
5 + 5 + 1 = 11

Go Math 1st Grade Chapter 3 Test Algebra Add 3 Addends Lesson 3.4 Question 2.

So, 9 + 8 = __

Answer:
9 + 8 = 17
The number sentence with doubles fact =
8 + 8 + 1 = 17

Use doubles to help you add.

Question 3.
8 + 7 = __
Answer: Doubles plus one fact.

Explanation :
8 + 7 = 15
The number sentence with doubles fact :
7 + 7 + 1 = 15

Question 4.
6 + 5 = __

Answer: Doubles plus one fact.

Explanation :
6 + 5 = 11
The number sentence with doubles plus one fact :
5 + 5 + 1 = 11

Question 5.
7 + 6 = __

Answer: Doubles plus one fact .

Explanation :
7 + 6 = 13
The number sentence with doubles plus one fact :
6 + 6 + 1 = 13

Problem Solving

Solve. Draw or write to explain.

Go Math 1st Grade Lesson 1 Homework 3.4 Question 6.
Bo has 6 toys. Mia has 7 toys. How many toys do they have?
__ toys

Answer: 13

Explanation:
The number of toys Bo have = 6
The number of toys Mia have = 7
Total : 6 +7 = 13
Therefore, the total number of toys they both have = 13

Question 7.
WRITE Math
Draw and label a picture to show how knowing 7 + 7 helps you find 7 + 8.

Lesson Check

Question 1.
Use doubles to find the sum of 7 + 8. Write the number sentence.
__ + __ + __ = __
Answer:
The sum of 7 + 8 = 15
The number sentence with doubles plus one fact :
7 + 7 + 1 = 15

Spiral Review

Question 2.
Circle the part you take from the group. Cross it out. Then write the difference.

8 – 6 = __

Answer:
8 – 6 = 2

Question 3.
There are 7 gray kittens. 2 kittens are black. How many fewer black kittens are there than gray kittens?
Use the bar model to solve. Then write the number sentence.

__ – __ = __

Answer:
7 – 2 = 5
Therefore, there are 5 fewer black kittens are there than gray kittens.

Lesson 3.5 Doubles Plus 1 and Doubles Minus 1

Essential Question
How can you use what you know about doubles to find other sums?

Listen and Draw

How can you use the doubles fact, 4 + 4, to solve each problem? Draw to show how. Complete the addition sentence.

Answer :

1. 4 + 4 + 1 = 9 – Doubles plus one fact
2.  4 + 4 – 1 = 7 – Doubles minus one fact.

Math Talk
MATHEMATICAL PRACTICES

Explain what happens to the doubles fact when you increase one addend by one or decrease one addend by one.

Share and Show MATH BOARD

Use to add. Solve the doubles fact. Then use doubles plus one or doubles minus one. Circle + or − to show how you solved each one.

Question 1.

Answer:
2 + 2 = 4
2+ 2+ 1 = 5  doubles plus one
2 + 2 – 1 = 3 – doubles minus one.

Question 2.

Answer :
3 + 3 = 6
3 + 3 + 1 = 7 – Doubles plus one
3 + 3 – 1 = 5 – Doubles minus one

Question 3.

Answer :
4 + 4 = 8
4 + 4 + 1 = 9 – Doubles plus one
4 + 4 – 1 = 7 – Doubles minus one

On Your Own

MATHEMATICAL PRACTICE
Make Connections Add. Write the doubles fact you used to solve the problem.

Question 4.
8 + 9 = __

Answer:
Doubles plus one fact .

Explanation :
8 + 9 = 17
The number sentence with doubles plus one fact :
8 + 8 + 1 = 17

Question 5.
2 + 3 = __

Answer:
Doubles plus one fact .
Explanation :
2 + 3 = 5
The number sentence with doubles plus one fact :
2 + 2 + 1 = 5

Question 6.
7 + 6 = __

Answer:
Doubles plus one fact .

Explanation :
7 + 6 = 13
The number sentence with doubles plus one fact :
6 + 6 + 1 = 15

Question 7.
6 + 5 = __

Answer:
Doubles plus one fact .

Explanation :
6 + 5 = 11
The number sentence with doubles plus one fact :
5 + 5 + 1 = 15

Question 8.
3  + 4 = __

Answer:
Doubles plus one fact .

Explanation :
3 + 4 = 7
The number sentence with doubles plus one fact :
3 + 3 + 1 = 7

Go Math Grade 1 Chapter 3 Answer Key Question 9.
4 + 5 = __

Answer:
Doubles plus one fact .

Explanation :
4 + 5 = 9
The number sentence with doubles plus one fact :
4 + 4 + 1 = 15

Question 10.
THINK SMARTER
Brianna has 6 toy ducks. Ian has the same number of toy ducks and a toy fish. How many toys do Brianna and Ian have?

Answer : 13

Explanation :
The number of toy ducks Brianna

THINK SMARTER
Add. Write the doubles plus one fact. Write the doubles minus one fact.

Question 11.

Answer :
6 + 6 = 12
6 + 6 + 1 = 1 3
6 + 6 – 1 = 11

Problem Solving • Applications

Question 12.
GO DEEPER
Grace wants to write the sums for the doubles plus one and doubles minus one facts. She has started writing sums. Help her find the rest of the sums.

Question 13.
THINK SMARTER
Choose all the doubles facts that can help you solve 4 + 5.

Answer :
9 + 9 = 18 – No
5 + 5 = 10 -Yes
4 + 4 = 8 – Yes

TAKE HOME ACTIVITY
• Have your child explain how to use a doubles fact to solve the doubles plus one fact 4 + 5 and the doubles minus one fact 4 + 3.

Doubles Plus 1 and Doubles Minus 1 Homework & Practice 3.5

Add. Write the doubles fact you used to solve the problem.

Question 1.
8 + 7 = __

Answer:
Doubles plus one fact .

Explanation :
8 + 7 = 15
The number sentence with doubles plus one fact :
7 + 7 + 1 = 15

Question 2.
6 + 7 = __

Answer:
Doubles plus one fact .

Explanation :
6 + 7 = 13
The number sentence with doubles plus one fact :
6 + 6 + 1 = 13

Question 3.
4 + 3 = __

Answer:
Doubles plus one fact .

Explanation :
4 + 3 = 7
The number sentence with doubles plus one fact :
3 + 3 + 1 = 7

Question 4.
2 + 1 = __

Answer:
Doubles plus one fact .

Explanation :
2 + 1 = 3
The number sentence with doubles plus one fact :
1 + 1 + 1 = 3

Question 5.
8 + 9 = __

Answer:
Doubles plus one fact .

Explanation :
8 + 9 = 17
The number sentence with doubles plus one fact :
8 + 8 + 1 = 17

Question 6.
3 + 2 = __

Answer:
Doubles plus one fact .

Explanation :
3 + 2 = 5
The number sentence with doubles plus one fact :
2 + 2 + 1 = 5

Problem Solving

Question 7.
Andy writes an additional fact. One addend is 9. The sum is 17. What is the other addend? Write the additional fact.
__ + ___ = 17

Answer :
9 + 8 = 17
Therefore, other addends = 8

Circle The Greater Addend Go Math Pdf Grade 1 Question 8.
WRITE Math
Use pictures or words to explain how you would use doubles plus one to solve 4 + 5.

Answer :
4 + 5 = 9
By using doubles plus one fact ,
4 + 4 + 1 = 9

Lesson Check

Question 1.
Use the picture. Write a doubles plus one-number sentence.

__ + __ + __

Answer:
The number sentence with double plus one :
2 + 2 + 1 = 5

Question 2.
Which doubles fact helps you solve 8 + 7 = 15? Write the number sentence.
__ + __ + __

Answer:
8 + 7 = 15
The number sentence with doubles plus one fact  :
7 + 7 + 1 = 15

Spiral Review

Question 3.
There are 7 large dogs and 2 small dogs. How many dogs are there?
Use ○ to solve. Draw to show your work. Write the number sentence and how many.
__ dogs

Answer :
7 + 2 = 9
Therefore, total number of dogs = 9

Question 4.
What is the sum of 2 and 1 more? Draw the . Write the sum.
__ 2 + 1 = __

Answer : 2 + 1 = 3

+ =

Lesson 3.6 Practice the Strategies

Essential Question
What strategies can you use to solve addition fact problems?

Listen and Draw

Think of different addition strategies. Write or draw two ways you can solve 4 + 3.

Math Talk
MATHEMATICAL PRACTICES
Look for Structure Why is the sum the same when you use different strategies?

Model and Draw

These are the ways you have learned to find sums.

Share and Show MATH BOARD

Question 1.

Answer :
4 + 1 =5
5+ 1 = 6
6+ 1= 7
7 + 1 = 8

Question 2.

5+ 2= 7
6 + 2 = 8
7 + 2 = 9
8 + 2 = 10

Question 3.

Answer :
6 + 3 = 9
7 + 3 = 10
8 + 3 = 11
9 + 3 = 1 2

Question 4.

Answer :
7 + 7 = 14
8 + 8 = 16
9 + 9 =18
10 + 10 = 20

Question 5.

Answer :
Doubles plus one :
5 + 5 + 1 = 11
6 + 6 + 1 = 13
Doubles minus one :
7 + 7 – 1 = 15
8 + 8 -1 = 17

On Your Own

MATHEMATICAL PRACTICE
Apply Add. Color doubles facts . Color count on facts . Color doubles plus one or doubles minus one facts .

Question 6.
9 + 9 = __

Answer :
Doubles fact
9 + 9 = 18

Question 7.
7 + 1 = __

Answer :

7 + 1 = 8

Question 8.
5 + 3 = __

Answer :

5 + 3 = 8

Question 9.
2 + 9 = __

Answer :
2 + 9 = 11

Question 10.
7 + 3 = __

Answer :
7 + 3 = 10

Question 11.
7 + 7 = __

Answer :
7 + 7 = 14

Question 12.
6 + 5 = __

Answer :
6 + 5 = 11

Question 13.
2 + 8 = __

Answer :
8 + 2 = 10

Question 14.
8 + 8 = __

Answer :
8 + 8 = 16

Question 15.
8 +9 = __

Answer :
8 + 9 = 17

Question 16.
9 + 3 = __

Answer :
9 + 3 = 12

Question 17.
7 + 8 = __

Answer :
7 + 8 = 15

THINK SMARTER
Make a counting on the problem. Write the missing numbers.

Question 18.
__ birds were in a tree. __ more birds flew there. How many birds are in the tree now?
__ birds

Answer :
The birds on a tree = 7
The number of birds flew there = 3
Total : 7 + 3 = 10

TAKE HOME ACTIVITY
• Have your child point out a doubles fact, a doubles plus one fact, a doubles minus one fact, and a fact he or she solved by counting on. Have him or her describe how each strategy works.

Practice the Strategies Homework & Practice 3.6

Add. Color doubles facts . Color count on facts . Color doubles plus one or doubles minus one facts .

Question 1.
8 + 8 = __

Answer:
8 + 8 = 16

Question 2.
8 + 1 = __

Answer :
8 + 1 = 9

Question 3.
1 + 7 = __

Answer :
1 + 7 = 8

Question 4.
8 + 3 = __

Answer :
8  + 3 = 11

Go Math Grade 1 Chapter 3 Pdf Lesson 6 Homework 3.6 Question 5.
5 +5 = __

Answer :
5 + 5 = 10

Question 6.
8 + 7 = __

Answer :
8 + 7 = 15

Question 7.
8 + 9 = __

Answer :
8 + 9 = 17

Question 8.
6 + 3 = __

Answer :
6 + 3 = 9

Question 9.
6 + 6 = __

Answer :
6 + 6 = 12

Problem Solving

Make a counting on problem. Write the missing numbers.

Question 10.
__ apples are in a bag. __ more apples are put in the bag. How many apples are in the bag now?
__ apples

Answer :
5 apples are in a bag.
2 more apples are put in the bag.
Total number of apples = 5 + 2 = 7

Question 11.
WRITE Math
Use pictures or words to explain a strategy you would use to find 8 + 9.

Answer :
8 + 9 = 17

Lesson Check

Question 1.
Which strategy would you use to find 2 + 8? Explain how you decided.
_________________________
_________________________

Answer :
Count on.
8 + 2 = 10

Question 2.
What is the sum of 9 + 9? Write the number.
__

Answer: 18
The sum of 9 + 9= 18

Spiral Review

Question 3.
What is the sum of 5 + 2 or 2 + 5? Why is the sum the same?
_________________________
_________________________

Answer: The sum of 5 + 2 or 2 + 5 = 7
The sum is same because

Question 4.
How many flowers are there? Write the number.
3 flowers and 3 more flowers __ flowers

Answer: 6
3 + 3 = 6

Addition Strategies Mid-Chapter Checkpoint

Concepts and Skills

Add. Change the order of the addends. Add again.

Question 1.

Answer :
4 + 8 = 12

Question 2.

Answer :
9 + 7 = 16

Circle the greater addend. Count on to find the sum.

Question 3.

Answer:
Greater addend : 8
1 + 8 = 9

Question 4.

Answer:
Greater addend : 7
3 + 7 = 10

Question 5.

Answer:
Greater addend : 9
9 + 2 = 11

Question 6.

Answer :
Greater addend  : 6
6 + 3 = 9

Question 7.

Answer :
Greater addend  : 7
7 + 1 = 8

Question 8.

Answer :
Greater addend  : 8
2 + 8 = 10

Use doubles to help you add.

Question 9.
7 + 8 = __

Answer :
7 + 8 = 15
Doubles fact :
7 + 7 + 1 = 15

Question 10.
6 + 7 = __

Answer :
6 +7 = 13
Doubles fact  :
6 + 6 + 1 = 13

Question 11.
9 + 8 = __

Answer :
9 + 8 = 17
Doubles fact :
8 + 8 +1 = 17

Question 12.
THINK SMARTER
Write a count on 1 fact to show a sum of 8. Then write a doubles fact to show a sum of 8.

Answer :
Count on fact to show sum of 8 =
7 +1 = 8
Doubles fact plus one = 4+ 4+ 1 = 8

Lesson 3.7 Add 10 and More

Essential Question
How can you use a ten frame to add 10 and some more?

Listen and Draw

What is 10 + 5? Use and the ten frame. Model and draw to solve.

Answer:
10+ 5 = 15

Math Talk
MATHEMATICAL PRACTICES
Reasoning Explain how your model shows 10 + 5.

Model and Draw
You can use a ten frame to add 10 + 6.

Share and Show MATH BOARD

Draw to show 10. Draw to show the other addend. Write the sum.

Question 1.

Answer:
10 + 3 = 13

+

Question 2.

Answer :

+

=

Adding Strategies Topic 3 Lesson 3.7 Answer Key Question 3.

Answer :
10+ 1 = 11

+

=

Question 4.

Answer :
10 + 2 = 12

+

=

Question 5.

Answer :
10+ 4 = 14

+

=

Question 6.

Answer :
10+ 7 = 17

+

=

On Your Own

MATHEMATICAL PRACTICE
Represent a Problem
Draw to show 10. Draw to show the other addend. Write the sum.

Question 7.

Answer:
10 + 8 = 18

+

=

Question 8.

Answer:
10 + 2 = 12

+ =

Question 9.

Answer:
10 + 6 = 16

         =

+

Question 10.

Answer:
10+9 = 19

     

+   

 =

Add.

Go Math Grade 1 Chapter 3 Review Test Question 11.

Answer:
10+ 1 = 11

   

+

=

Question 12.

Answer :
4 + 10 = 14

             

+   

 =

Question 13.

Answer :
5 + 10 = 15

             

+           

 =

Question 14.

Answer :
10 + 3 = 13

   

+

=

Question 15.

0 + 10 = 10

Question 16.
THINK SMARTER
Draw to show 10. Draw to show the missing addend. Write the missing addend.

Answer:
10+ 4 = 14

+ =

Problem Solving • Applications

GO DEEPER
Draw . Write the addition sentence. Explain your model.

Question 17.
Marina has 10 crayons. She gets 7 more crayons. How many crayons does she have now?

Answer:
1 7

Explanation :
The number of crayons Marina have = 10
The number of crayons she gets more = 7
Addition sentence : 1 0 + 7 = 17
Therefore, total crayons Marina have = 17

Question 18.
THINK SMARTER
Match the models to the number sentences.

Answer :

TAKE HOME ACTIVITY
• Have your child choose a number between 1 and 10 and then find the sum of 10 and that number. Repeat using other numbers.

Add 10 and More Homework & Practice 3.7

Draw red ○ to show 10. Draw ○ yellow to show the other addend. Write the sum.

Question 1.

Answer :
10 + 7 = 17

Question 2.

Answer :
10+ 5 = 15

Problem Solving

Draw red and yellow ○ to solve. Write the addition sentence.

Question 3.
Linda has 10 toy cars. She gets 6 more cars. How many toy cars does she have now?
__ + __ = __ toy cars

Answer: 16

Explanation:
The number of toys Linda have = 10
The number of toys she gets more = 6
Total : 10 + 6 = 16
Therefore, the total number of toys she have now = 16

Question 4.
WRITE Math
Use pictures or words to explain how you can solve 10 + 6.

Lesson Check

Question 1.
Draw more to show the addition fact. Then solve.

Question 2.
What number sentence does this model show? Write the number sentence.

__ + __ = __

Answer:
The addition sentence :
10 + 8 = 18

Spiral Review

Question 3.
Show three different ways to make 10. Write the number sentences.

Answer:

1. 2 + 8 = 10

2. 5 + 5 = 10

3. 8 + 2 = 10

Go Math Grade 1 Chapter 3 First Grade Addition Strategies Question 4.
There are 3 large turtles and 1 small turtle. How many turtles are there? Write the number sentence and how many.
__ turtles

Answer : 4

Explanation :
The number of large turtles : 3
The number of small turtles = 1
Number sentence : 3 + 1 = 4
Therefore, total number of turtles = 4

Lesson 3.8 Make a 10 to Add

Essential Question
How do you use the make a ten strategy to add?

Listen and Draw
What is 9 + 6? Use and the ten frame. Model and draw to solve.

Answer:
9 + 6 = 15
9 + 1 = 10
10 + 5 = 15

Math Talk
MATHEMATICAL PRACTICES
Use Tools Why do you start by putting 9 counters in the ten frame?

Model and Draw

Why do you show 8 in the ten frame to find 4 + 8?

Share and Show MATH BOARD
Use and a ten frame. Show both addends. Draw to make a ten. Then write the new fact. Add.

Question 1.

Answer :
9 + 5 = 14
9 + 1 = 10
So, 10 + 4 = 14

  + =

                                           

Question 2.

Answer :
4 + 7 = 11
7 + 3 = 10
10 + 1 = 11

+ =

                                                         

Question 3.

Answer :
9 + 8 = 17
9 + 1 = 10
10+ 7 = 17

  + = 

                               

On Your Own

MATHEMATICAL PRACTICE
Use a Concrete Model

Use and a ten frame. Show both addends. Draw to make a ten. Then write the new fact. Add.

Question 4.

Answer :
8 + 2 = 10
10 + 3 = 13
So, 5 + 8 = 13

+ =

                                                         

Draw to make a ten. Write the missing number.

Question 5.
THINK SMARTER
Andrew has visited Cedar Hill State Park 7 times. Cathy has visited the same park 9 times. How many times did they both visit the park.

__ visits

Answer : 16 times

+ =

                                   

Question 6.
THINK SMARTER
What strategy would you choose to solve 7 + 8? Why?

Problem Solving • Applications WRITE Math

Solve.

Question 7.
10 + 8 has the same sum as 9 + __.

Answer:
10+ 8 = 18
9 + 9 = 18

Question 8.
10 + 7 has the same sum as 8 + __.

Answer:
10 + 7 = 17
8 +  9 = 17

Question 9.
10 + 5 has the same sum as 6 + __.

Answer :
10 +5 = 15
6 + 9 = 15

Question 10.
GO DEEPER
Write the numbers 6, 8, or 10 to complete the sentence __ + __ has the same sum as __ + 8

Answer:
10+ 6 = 18 has the same sum of 8 + 8.

Question 11.
THINK SMARTER
The model shows 7 + 4 = 11. Write the 10 fact that has the same sum.

Answer:
7 + 3 = 10
10 + 1 = 11
So, 7 + 4 = 11

TAKE HOME ACTIVITY
• Cut off 2 cups from an egg carton or draw a 5-by-2 grid on a sheet of paper to create a ten frame. Have your child use small objects to show how to make a ten to solve 8 + 3, 7 + 6, and 9 + 9.

Make a 10 to Add Homework & Practice 3.8

Use red and yellow ○ and a ten frame. Show both addends. Draw to make a ten. Then write the new fact. Add.

Question 1.

Answer:
5 + 5 = 10
10 + 2 = 12
So, 5 + 7 = 12

Question 2.

Answer:
9 + 1 = 10
10 + 4 = 14
So, 9 + 5 = 14

Problem Solving

Solve.
Question 3.
10 + 6 has the same sum as 7 + __.

Answer: 9
10 + 6 = 16
7 + 9 = 16

Question 4.
WRITE Math Use pictures or words to explain how you would use the make a ten strategy to solve 5 + 7.

Answer:
5 + 7 = 12
5 + 5 = 10
10 + 2 = 12

Lesson Check

Question 1.
What sum does this model show? Write the number.

Answer:
Number sentence :
10 + 5 = 15

Question 2.
What addition sentence does this model show? Write the number sentence.

Answer:
Number sentence :
10 + 4 = 14

Spiral Review

Question 3.
What is the sum of 4 + 6? Write the sum.
__

Answer:
4 + 6 = 8
The sum of 4 + 6 = 8

Question 4.
There are 2 big flowers and 4 small flowers. How many flowers are there? Write the number sentence and how many.
__ flowers

Answer: 6

Explanation :
The number of big flowers = 2
The number of small flowers = 4
Number sentence : 2 + 4 = 6
Therefore, Total number of flowers = 6

Lesson 3.9 Use Make a 10 to Add

Essential Question
How can you make a ten to help you add?

Listen and Draw

Draw to show the addends. Then draw to show how to make a ten. Write the sum.

Answer:
6 + 7 = 13

       

                               = 

                     

Math Talk
MATHEMATICAL PRACTICES
Represent Describe how the drawings show how to make a ten to solve 6 + 7.

Model and Draw

What is 9 + 6?

Share and Show MATH BOARD

Write to show how you make a ten. Then add.

Question 1.
What is 8 + 4?

So, 8 + 4 = __

Answer:
8 + 2 + 2 = 12
10 + 2 = 12
So, 8 + 4 = 12

Question 2.
What is 5 + 7?

So, 5 + 7 = __

Answer:
7 + 3 = 10
10 + 2 = 12
So, 5 + 7 = 12

On Your Own

THINK SMARTER
Write to show how you make a ten. Then add.

Question 3.
What is 7 + 8?

So, 7 + 8 = __

Answer:
8 + 2 = 10
10 + 5 = 15
So, 7 + 8 = 15

Question 4.
What is 9 + 8?

So, 9 + 8 = __

Answer:
9 + 1 = 10
1 0 + 7 = 17
So, 9 + 8 = 17 .

MATHEMATICAL PRACTICE
Use Models

THINK SMARTER
Use the model. Write to show how you make a ten. Then add.

Question 5.
Joe has 8 green balls of clay. Leah has 6 blue balls of clay. How many balls of clay do they have?

Answer:
8 + 2 + 4
10 + 4 = 14
So, 8 + 6 = 14
Therefore, There are  14 balls of clay.

Problem Solving • Applications WRITE Math

Use the clues to solve. Draw lines to match.

Question 6.
Han, Luis, and Mike buy apples. Mike buys 10 red apples and 4 green apples. Luis and Mike buy the same number of apples. Match each person to his apples.

Answer:

Question 7.
GO DEEPER
Look at Exercise 6. Han eats one apple. Now he has the same number of apples as Luis and Mike. How many red and green apples could he have?
__ red apples and __ green apples

Answer :
7 red apples and 7 green apples

Question 8.
THINK SMARTER
Does the addition show how to make a ten to add? Choose Yes or No.

Answer:

1. 8 + 2 + 2 = Yes
2. 5 + 4 + 3 = No
3. 6 + 7 + 3 = Yes

Use Make a 10 to Add Homework & Practice 3.9

Write to show how you make a ten. Then add.

Question 1.
What is 9 + 7?

__ + __ = __
So, 9 + 7 = __

Answer :
9 + 1 + 6
9 + 1 = 10
So, 9 + 6 = 15

Question 2.
What is 5 + 8?

__ + __ = __
So, 5 + 8 = __

Answer :
8 + 2 + 3
8 + 2= 10
So, 5 + 8 = 13

Problem Solving

Use the clues to solve. Draw lines to match.

Question 3.
Ann eats 10 green grapes and 6 red grapes. Gia eats the same number of grapes as Ann. Match each person to her grapes.

Answer:
Ann – 10 green grapes and 6 red grapes.
Gia – 7 green grapes and 9 red grapes.

Question 4.
WRITE Math
Draw to explain how you would make a ten to find 5 + 8.

Lesson Check

Question 1.
Write the number sentence. Make a ten to find 8 + 4. Write the number sentence.

__ + __ + __ = __

Answer :
8 + 2 = 10
10 + 2 = 14

Spiral Review

Question 2.
What is the difference? Complete the subtraction sentence.

Answer:
5 – 5 = 0

Question 3.
What is the difference? Write the difference.

Answer :
8 – 2 = 6

Lesson 3.10 Algebra • Add 3 Numbers

Essential Question
How can you add three addends?

Listen and Draw

Use to model the problem. Draw to show your work.
__ birds

Math Talk
MATHEMATICAL PRACTICES
Apply Which two addends did you add first? Explain.

Share and Show MATH BOARD

Use to change which two addends you add first. Complete the addition sentences.

Question 1.
5 + 2 + 3 = __

Answer:
5 + 2 + 3 = 10

Addition sentences :

1.  7 + 3 = 10
2.  5 + 5 = 10

1st Grade Go Math Pdf Lesson 3.10 Answer Key Question 2.
3 + 4 + 6 = __

Answer:
3 + 4 + 6  = 13

Addition sentences :

1.  3 + 10 = 13
2.  7 + 6 =   13

On Your Own

MATHEMATICAL PRACTICE

Compare Models
Look at the . Complete the addition sentences showing two ways to find the sum.

Question 3.
7 + 3 + 1 = __

Answer:
7 + 3 + 1 = 11
Addition sentences :

1. 7   + 4 = 11
2. 10 + 1 = 11

Question 4.
3 + 6 + 3 = __

Answer:
3 + 6 + 3 = 12

1.  6 + 6 = 12
2.  3 + 9 = 12

GO DEEPER
Solve both ways.

Question 5.

Answer:
2 + 3 + 7 = 12

1. 2 + 10 = 12
2. 5 +  7  = 1 2

Question 6.
THINK SMARTER
I used to model 3 addends. Use my model. Write the 3 addends.

Answer:
Addition sentence :
2 + 2 + 3 = 7

Problem Solving • Applications

Question 7.
THINK SMARTER
Choose three numbers from 1 to 6. Write the numbers in an addition sentence. Show two ways to find the sum.

Answer:
6 = 4 + 2
6 = 5 + 1

Question 8.
THINK SMARTER
Write each addition sentence in the box that shows the sum.

Answer:
The addition sentences shows the sum 12 are :
1. 2 + 2 + 8 = 12
2.  6 + 0 + 6 = 12
The addition sentences shows the sum 13 are :

1.  3 + 5 + 5 = 13
2.  4 + 4 +5 = 13

TAKE HOME ACTIVITY
• Have your child draw to show two ways to add the numbers 2, 4, and 6.

Algebra • Add 3 Numbers Homework & Practice 3.10

Look at the . Complete the addition sentences showing two ways to find the sum.

Question 1.
5 + 4 + 2 = __

Answer: 11

Explanation:
The two addition sentences  to find the sum are

1.  5 + 6 = 11
2.  9 + 2 = 11

Problem Solving

Question 2.
Choose three numbers from 1 to 6. Write the numbers in an addition sentence. Show two ways to find the sum.

Question 3.
WRITE Math
Use pictures or words to explain how you can find the sum for 3 + 5 + 2.

Answer:
3 + 5 + 2 = 10

+  + =

Lesson Check

Question 1.
What is the sum of 3 + 4 + 2? Write the sum.
__

Answer: 9

Explanation:
The sum of 3 + 4 + 2 = 9
Therefore, sum = 9

Question 2.
What is the sum of 5 + 1 + 4? Write the sum.
__

Answer: 10

Explanation:
The sum of 5 + 1 + 4 = 10
Therefore, sum = 10

Spiral Review

Question 3.
What is the sum of 3 and 7?

Answer: 10

Explanation:
The sum of 3 and 7:
3 + 7 =10

Question 4.
4 cows are in the barn. 2 more cows join them. How many cows are in the barn now?

Complete the model and the number sentence.
__ cows 4 + 2 = __

Answer:
Number sentence :
4 + 2 = 6
Therefore, the number of cows in the barn = 6

Lesson 3.11 Algebra • Add 3 Numbers

Essential Question
How can you group numbers to add three addends?

Listen and Draw

Listen to the problem. Show two ways to group and add the numbers.

Math Talk
MATHEMATICAL PRACTICES

Apply Describe the two ways you grouped the numbers to add.

Share and Show MATH BOARD

Choose a strategy. Circle two addends to add first. Write the sum. Then find the total sum. Then use a different strategy and add again.

Question 1.

Answer:
Two addends : 6 , 4
Sum : 6 + 4 = 10
Total sum : 6 + 4 + 2 = 12

Question 2.

Answer:
Two addends : 3 , 4
Sum : 3 + 4 = 7
Total sum : 3 + 4 + 4 = 11

Question 3.

Answer:
Two addends : 2 , 5
Sum : 2 + 5 = 7
Total sum : 2 + 5 + 0 = 7

Question 4.

Answer:
Two addends : 5 , 5
Sum : 5 + 5 = 10
Total sum : 5 + 4 + 5 = 14

On Your Own

MATHEMATICAL PRACTICE
Use Repeated Reasoning Choose a strategy. Circle two addends to add first. Write the sum.

Question 5.

Answer:
Two addends : 8 , 2
Sum : 8 + 2 + 2 =12

Question 6.

Answer :
Two addends : 6, 0
Sum : 6 + 0 + 8 = 14

Question 7.

Answer :
Two addends : 3 , 4
Sum : 3 + 4 + 6 = 13

Question 8.

Answer:
Two addends : 2 , 3
Sum : 2 + 3 + 7 = 12

Question 9.

Answer:
Two addends : 7 , 7
Sum : 7 + 7 + 2 = 16

Question 10.

Answer:
Two addends : 1 , 1
Sum : 1 + 9 + 1 = 11

Question 11.

Answer:
Two addends : 4 , 4
Sum : 5 + 4 + 4 = 13

Question 12.

Answer :
Two addends : 5 , 5
Sum: 5 + 5+ 5 = 15

Question 13.
THINK SMARTER
Susan has 7 shells. Kai has 3 shells. Zach has 5 shells. How many shells do they have?
__ + __ + __ + __ = __ shells

Answer: 15

Explanation :
The number of shells Susan has = 7
The number of Shells Kai have = 3
The number of shells Zach have = 5
Total : 7 + 3 + 5 = 15
Therefore, the number of  shells they have = 7+3+5 = 15

THINK SMARTER
Write the missing addends. Add.

Question 14.

Answer:
The possible addend be 0,8 ; 1,7; 2,6; 3,5; 4,4 ; 5,3 ; 6,2 ; 7,1 ; 8,0
The sum of the number sentence is 11

Question 15.

Answer:
Possible addends are : 0,7; 1,6; 2,5; 3,4; 4,3; 5,2; 2,6; 1,7; 7,0.
The sum of number sentence = 10

Problem Solving • Applications

Draw a picture. Write the number sentence.

Question 16.
Maria has 3 cats. Jim has 2 cats. Cheryl has 5 cats. How many cats do they have?
__ + __ + __ = __ cats

Answer: 10

Explanation:
The number of cats Maria have = 3
The number of cats Jim have = 2
The number of cats Cheryl have = 5
Total : 3 + 2 + 5= 10
Therefore, the total number of cats Maria have = 10

+ + =

Question 17.
Tony sees 5 small turtles. He sees 0 medium turtles. He sees 4 big turtles. How many turtles does he see?
__ + __ + __ = __ turtles

Answer:  9

Explanation:
The number of small turtles = 5
The number of medium turtles = 0
The number of big turtles = 4
Total : 5 + 0 + 4 = 9
Therefore, the number of turtles tony have = 9

+ 0 + =

.

Question 18.
GO DEEPER
Kathy sees 13 fish in the tank. 6 fish are gold. The rest are blue or red. How many of each could she see?
__ + __ + 6 = 13 fish

Answer:
The sum of  blue and red fish is 7
Total number of fishes in the tank = 13
Number of gold fishes = 6
Let, the number of blue fishes = 3
the number of red fishes = 4
Total red and blue fishes = 3 + 4 = 7
Number sentence : 3 + 4 + 6 = 14

+ + =

                               

Question 19.
THINK SMARTER
Write two ways to group and add 2 + 3 + 4.

Answer:
2 + 3 + 4 = 9

1. 6 + 3 = 9
2. 2 + 7 = 9

TAKE HOME ACTIVITY
• Have your child look at Exercise 18. Have your child tell you how he or she decided which numbers to use. Have him or her tell you two new numbers that would work.

Algebra • Add 3 Numbers Homework & practice 3.11

Choose a strategy. Circle two addends to add first. Write the sum.

Question 1.

Answer:
Two addends : 7, 3
Sum : 7 + 3 + 3 = 13

Question 2.

Two addends : 2 , 2
Sum : 2 + 2+ 6 = 10

Question 3.

Answer:
Two addends : 6 , 6
Sum : 6 + 6 +3 = 15

Question 4.

Answer:
Two addends : 0 , 8
Total : 2 + 0 + 8 = 10

Problem Solving

Draw a picture. Write the number sentence.

Question 5.
Don has 4 black dogs. Tim has 3 small dogs. Sue has 3 big dogs. How many dogs do they have?
__ + __ + __ = __ dogs

Answer: 10

Explanation :
The number of dogs Don have = 4
The number of dogs Tim have = 3
The number of dogs Sue have = 3
Total : 4 + 3 +3 = 10
Therefore, the number of dogs they have = 10

+ + =

Question 6.
WRITE Math
Use pictures or words to explain how you would find 6 + 4 + 4.

Answer :
6 + 4 + 4 = 14

Lesson Check

Question 1.
What is the sum of 4 + 4 + 2?
__

Answer:
4 + 4 + 2 = 10

Question 2.
Circle two addends to add first. Find the sum. Explain your strategy.

_______________
_______________

Answer:
7 + 3 = 10
Total sum : 7 + 3 + 2 = 12

Spiral Review

Question 3.
Write a doubles plus one fact for the sum of 7.
__ + __ = __

Answer:
A doubles plus one fact for the sum of 7 :
3 + 4 = 7
3 + 3 + 1 = 7

Question 4.
What addition sentence does this model show? Write the number sentence.

__ + __ = __

Answer:
Number sentence  :
8 + 3 = 11

Lesson 3.12 Problem Solving • Use Addition Strategies

Essential Question
How do you solve addition word problems by drawing a picture?

Megan put 8 fish in the tank. Tess put in 2 more fish. Then Bob put in 3 more fish. How many fish are in the tank now?

Unlock the Problem

What do I need to find?

What information do I need to use?
Megan put in 8 fish.
Tess put in 2 fish.
Bob put in 3 fish.

Show how to solve the problem.

__ fish

Answer : 13

Explanation :
Given,
Megan put in 8 fish.
Tess put in 2 fish.
Bob put in 3 fish.
Total : 8 + 2 + 3 = 13
Therefore, total number of fishes = 13

   + + =

                                                             

HOME CONNECTION
• Your child will continue to use this chart throughout the year to help him or her unlock the problem. In this lesson, your child used the strategy draw a picture to solve problems.

Try Another Problem

Draw a picture to solve.

Question 1.
Mark has 9 green toy cars. He has 1 yellow toy car. He also has 5 blue toy cars. How many toy cars does he have?

Answer : 15

Explanation :
The number of green toy cars = 9
The number of yellow toy cars = 1
The number of blue toy cars = 5
Total :
9 + 1 + 5 = 15
Therefore, the total number of toy cars he have now = 15

Math Talk
MATHEMATICAL PRACTICES
Reasoning Explain how using make a ten helps you solve the problem.

Share and Show MATH BOARD

MATHEMATICAL PRACTICE

Write an Equation Draw a picture to solve.

Question 2.
Ken put 5 marbles in a jar. Lou put in 0 marbles. Mae put in 5 marbles. How many marbles did they put in the jar?

Answer: 10

Explanation :
The number of marbles Ken kept in a jar = 5
The number of Lou kept in a jar = 0
The number of marbles Mae kept in jar = 5
Total : 5 + 0 + 5 = 10 marbles
Therefore, there are 10 marbles in the jar.

Question 3.
Ava has 3 kites. Lexi has 3 kites. Fred has 5 kites. How many kites do they have?

Answer : 11

Explanation :
The number of kites Ava have = 3
The number of kites Lexi have = 3
The number of kites Fred have = 5
Total : 3 + 3 + 5 = 11 Kites
Therefore, the number of kites they have = 11

Question 4.
Al got 8 books at the library. Ryan got 7 books. Dee got 1 book. How many books do they have?

Answer : 16

Explanation :
The number of books Al got from library = 8
The number of books Ryan got from library = 7
The number of books Dee got from library = 1
Total : 8 + 7 + 1 = 16 books
Therefore, the number of books they have = 16

Question 5.
Pete sends 4 letters. Then he sends 3 more letters. Then he sends 2 more letters. How many letters did Pete send?

Answer: 9

Explanation :
The number of letters Pete sends = 4
The number of letters he sends more = 3
Then also the number of letters he sends more = 2
Total : 4 + 3 + 2 = 9 letters
Therefore, the number of letters Pete sends = 9

On Your Own WRITE Math

Solve. Draw or write to show your work.

Question 6.
Kevin has 15 baseball cards. He gives away 8 baseball cards. How many baseball cards does he have?

__ baseball cards

Answer : 7

Explanation :
Total number of basketball cards = 15
The number of cards he gives away = 8
Now, the number basketball he have now =
15 – 8 = 7
Therefore, the number of cars he have now = 7

Question 7.
There are 14 pencils. Haley has 6 pencils. Mac has 4 pencils. Sid has some pencils. How many pencils does Sid have?

___ pencils

Answer: 4

Explanation :
Total number of pencils = 14
The number of pencils Haley have = 6
The number of pencils Mac have = 4
Total : 6 + 4 = 10
The number of pencils Sid have = 14 – 10 = 4
Therefore, Sid have 4 pencils.

Question 8.
GO DEEPER
12 marbles are in a bag. Shelly takes 3 marbles. Dan puts in 4. How many marbles are in the bag now?
__ marbles

Answer:

Explanation :
The total number of marbles in a bag = 12
The number of marbles Shelly takes out =
1 2 – 3 = 9
The number of marbles Dan puts in = 4
9 + 4 = 13
Therefore, total number of marbles in the bag = 13

Question 9.
THINK SMARTER
Eric has 4 pencils. Sandy gives Eric 3 pencils. Tracy gives Eric 5 more pencils. How many pencils does Eric have in all?
Eric has ☐ pencils in all.

Answer: 12

Explanation :
The number of pencils Eric have = 4
The umber of pencils Sandy gives Eric  = 3
The number of pencils Tracy gives Eric  = 5
Total : 4 + 3 + 5 = 12
Therefore, the total number pencils Eric have = 12.

TAKE HOME ACTIVITY
• Ask your child to look at Exercise 8 and tell how he or she found the answer.

Problem Solving • Use Addition Strategies Homework & Practice 3.12

Draw a picture to solve.

Question 1.
Franco has 5 crayons. He gets 8 more crayons. Then he gets 2 more crayons. How many crayons does he have now?

Answer : 15

Explanation :
The number of crayons Franco have = 5
The number of crayons he gets more = 8
The number of crayons he gets more = 2
Total number of crayons = 5 + 8 + 2 = 15
Therefore, the number of crayons he have now = 15

Question 2.
Jackson has 6 blocks. He gets 5 more blocks. Then he gets 3 more blocks. How many blocks does he have now?

Answer : 14

Explanation:
The number of blocks Jackson have = 6
The number of blocks Jackson gets more = 5 + 3 = 8
Total : 6 + 8 = 14
Therefore, Jackson have 14 blocks.

Question 3.
Ava has 7 gifts. Then he gets 2 more gifts. Then he gets 3 more gifts. How many gifts does Ava have now?

Answer : 12

Explanation :
The number of gifts Ava have = 7
The number of gifts Ava gets more = 2 + 3 = 5
Total : 7 + 5 = 12
Therefore, Ava have 12 gifts.

Question 4.
WRITE Math
Draw a picture to show how you would solve this problem.
Jeb has 4 large rocks. He has 4 medium rocks. He has 7 small rocks. How many rocks does Jeb have?

Answer: 15

Explanation :
The number of large rocks Jeb have = 4
The number of medium rocks Jeb have = 4
The number of small rocks Jeb have = 7
Total : 4 + 4 + 7 = 15
Therefore, Jeb have 15 rocks.

Lesson Check

Question 1.
Lila has 3 gray stones. She has 4 black stones. She also has 7 white stones. How many stones does she have? Write the number sentence.

Answer:
The total number of stones = 14
Number sentence: 3 + 4 + 7 = 14

Explanation :
The number of gray stones = 3
The number of black stones = 4
The number of white stones = 7
Total :
3 + 4 + 7 = 14

Question 2.
Patrick has 3 red stickers, 6 pink stickers, and 8 green stickers. How many stickers does Patrick have? Write the number sentence.

Answer:
The Total number of stickers = 17
Number sentence: 3 + 6 + 8 = 17

Explanation:
The number of red stickers = 3
The number of pink stickers = 6
The number of green stickers = 8
Total: 3 + 6 + 8 = 17

Spiral Review

Question 3.
What is the sum of 2 + 4 or 4 + 2? Write the number.
____

Answer: 6

Explanation:
The sum of of 2+4 or 4+2 = 6

Question 4.
There are 6 black pens. There are 3 blue pens. How many pens are there? Write the number.

Answer:
The total number of pens = 9
Number sentence : 6 + 3 =9

Explanation:
The number of black pens = 6
The number of blue pens = 3
Total : 6 + 3 = 9

Addition Strategies Chapter 3 Review/Test

Question 1.
Write the addends in a different order.
5 + 4 = 9
__ + __ = __

Answer:
The addition sentence with the addends in a different order =
4 + 5 = 9

Question 2.
Count on from 4. Write the number that shows 1 more.
__

Answer: 5

Question 3.
The cubes show a doubles fact. Choose the doubles fact and the sum.

Answer:
The addition sentence with doubles fact :
5 + 5 = 10
Therefore, The sum of cubes = 10

Question 4.
THINK SMARTER
There are 3 red leaves. There are 4 yellow leaves. How many leaves in all? Use a double to add. Write the missing numbers.

Answer:
3 + 4 = 3 + 3 +1
So, 3 + 4 = 7

Question 5.
Choose all the doubles facts that can help you solve 8 + 7.

Answer:

1.   7 + 7 = 14
2.   8 + 8 = 14

Question 6.
GO DEEPER
Write a count on 2 fact to show a sum of 10. Then write a doubles fact to show a sum of 10.

Answer:
Addition sentence on 2 fact to show a sum of 10
8 + 2 = 10
Addition sentence with doubles fact to show a sum of 10.
5 + 5 = 10

Question 7.
Match the models to the number sentences.

Answer :

Question 8.
The model shows 8 + 5 = 13.
Write the 10 fact that has the same sum.

Answer: 10 + 3 = 13

Explanation:
Given,
The model shows 8 + 5 = 13.
Addition sentence with 10 fact that has same sum =
10 + 3 = 13

Question 9.
Does the addition show how to make a ten to add? Choose Yes or No.

Answer:
1.  7 + 3 + 2 –  Yes
2.   7 + 5 +5  –  Yes
3.  5 + 4 + 7 –   No

Question 10.
Look at the . Complete the addition sentence to show the sum. Choose the missing number and the sum.

Answer:
2 + 3 + 4 = 9

Explanation :
The number of red cubes  = 2
The number of blue cubes = 3
The number of yellow cubes = 3
Now, The addition sentence :
2 + 3 + 4 = 9
Total sum of cubes = 9

Question 11.
Write two ways to group and add 4 + 2 + 5.
__ + __ = __
__ + __ = __

Answer:
4 + 2 + 5 = 11
The two ways are:
6 + 5 = 11
8 + 3 = 11

Question 12.
Beth sees 4 red birds. She sees 2 yellow birds. She sees 4 blue birds. Draw a picture of the birds.

Answer:
4 + 2 + 4 = 10
Beth sees = 10 birds

Final Words:

Learn the basics like addition, subtraction from the primary level itself. Refer to Go Math Grade 1 Answer Key Chapter 3 Addition Strategies to score good marks in the exams. Download the free pdf of HMH Go Math 1st Grade Answer Key Chapter 3 from this page.

Go Math Grade 1 Chapter 11 Answer Key Pdf: Students can learn to think, strategize and solve problems from Go Math First Grade Answer Key Chapter 11 rather than just obtain answers. Learn, Practice, Succeed using the 1st Grade Go Math Chapter 11 Three Dimensional Geometry Solutions. HMH Go Math Grade 1 Answer Key provides a full complement of preparation resources all in one place making your toggling between home and classroom seamless. Our experts use the same models and problem-solving methods for the grade to grade so that maths concepts stay with you and develop enduring knowledge.

Three-Dimensional Geometry Go Math Grade 1 Chapter 11 Answer Key Pdf

Go Math Grade 1 Chapter 11 Three Dimensional Geometry includes Questions from Chapter Tests, Review Tests, Assessments, Lessons, Homework & Practice, etc. To help you understand the concepts better we have provided step-by-step solutions for all the Problems in Go Math 1st Grade Solutions. In fact, all the Go Math Grade 1 Ch 11 Three Dimensional Geometry Answers are aligned as per the Go Math 1st Grade Textbooks. Begin your preparation without any delay and attempt the actual exam with confidence.

Three Dimensional Geometry

• Three–Dimensional Geometry Show What You Know – Page 630
• Three–Dimensional Geometry Vocabulary Builder – Page 631
• Three–Dimensional Geometry Game: Shape Match Bingo – Page 632
• Three–Dimensional Geometry Vocabulary Game – Page(632A-632D)

Lesson: 1 Three-Dimensional Shapes

• Lesson 11.1 Three-Dimensional Shapes – Page(633-638)
• Three-Dimensional Shapes Homework & practice 11.1 – Page(637-638)

Lesson: 2 Combine Three-Dimensional Shapes

• Lesson 11.2 Combine Three-Dimensional Shapes – Page(639-644)
• Combine Three-Dimensional Shapes Homework & Practice 11.2 – Page(643-644)

Lesson: 3 Make New Three-Dimensional Shapes

• Lesson 11.3 Make New Three-Dimensional Shapes – Page(645-650)
• Make New Three-Dimensional Shapes Homework & Practice 11.3 – Page(649-650)

Mid-Chapter Check Point

• Three–Dimensional Geometry Mid-Chapter Check Point – Page 648

Lessson: 4 Problem Solving • Take Apart Three-Dimensional Shapes

• Lessson 11.4 Problem Solving • Take Apart Three-Dimensional Shapes – Page(651-656)
• Problem Solving • Take Apart Three-Dimensional Shapes Homework & practice 11.4 – Page(655-656)

Lesson: 5 Two-Dimensional Shapes on Three-Dimensional Shapes

• Lesson 11.5 Two-Dimensional Shapes on Three-Dimensional Shapes – Page(657-662)
• Two-Dimensional Shapes on Three-Dimensional Shapes Homework & practice 11.5 – Page(661-662)
• Three–Dimensional Geometry Chapter 11 Review/Test – Page(663-666)

Curious George

What three-dimensional shapes do you see in the sand castle?

Answer:
Cone,cylinder,cube.

Explanation:
In the above sand castle there are many three-dimensional shapes that are cone,cylinder,cube.

Three–Dimensional Geometry Show What You Know

Alike and Different

Circle the objects that are alike.

Question 1.

Answer:

Explanation:
In the above shapes there are 2 cubes.So, circle cubes.

Question 2.

Answer:

Explanation:
In the above shapes there are 2 cones.So, circle cones.

Identify Three-Dimensional Shapes

Color the blue. Color the red. Color the yellow.

Question 3.

Answer:

Explanation:
The above given shape is cube.So, color it yellow.

Question 4.

Answer:

Explanation:
The above given shape is circle.So, color it blue.

Question 5.

Answer:

Explanation:
The above given shape is cylinder.So, color it red.

Sort by Size
Mark an X on the object that does not belong.

Question 6.

Answer:

Explanation:
In the above shapes the 3rd shape is big compared to the others.So, put a cross mark across it.

Three–Dimensional Geometry Vocabulary Builder

Visualize It
Write review words to name the shapes.

Answer:

Understand Vocabulary

Look at the three-dimensional shapes. Color the sphere Color the cube Color the cylinder

Question 1.

Answer:

Explanation:
The above given shape is cylinder.So, color it green.

Question 2.

Answer:

Explanation:
The above given shape is sphere.so, color it blue.

Question 3.

Answer:

Explanation:
The above given shape is cube.So, color it yellow

Three–Dimensional Geometry Game: Shape Match Bingo

Materials • 9 • 9 •
Play with a partner. Take turns.
1. One player uses . The other player uses .
2. Spin . Use a counter to cover a space with that shape.
3. If you cannot cover a space, your turn is over.
4. The first player to cover all of his or her spaces wins.

Three–Dimensional Geometry Vocabulary Game

Going Places with GOMATH! words

Going on a Train Trip

For 2 players

Materials

How to Play
1. Choose a and put it on START.
2. Toss the to take a turn. Move your that many spaces.
3. If you land on these spaces:
Red Space Take a Clue Card. Answer the question. If you are correct, move ahead 1. Return the Clue Card to the bottom of the pile.
Blue Space Follow the directions on the space.
4. Collect 5 Clue Cards. Move around the track as many times as you need to. Then, follow the closest center path to reach FINISH.
5. The first player to reach FINISH wins.

The Write Way

Reflect
Choose one idea. Draw and write about it.
• Tell about two of these words.

• Compare a curved surface to a flat surface. Tell how are they alike and how they are different.

Answer:

Lesson 11.1 Three-Dimensional Shapes

Essential Question
How can you identify and describe three-dimensional shapes?

Listen and Draw

Draw to sort the three-dimensional shapes.

Answer:

Explanation:
In the above picture there are two different shapes.They are cubes and spheres.

Math Talk
MATHEMATICAL PRACTICES
Generalize Explain how you sorted the shapes.

Model and Draw

These are three-dimensional shapes.

Share and Show MATH BOARD

Use three-dimensional shapes. Sort the shapes into three groups. Name and draw the shapes.

Question 1.
only flat surfaces

Answer:

Explanation:
Rectangular prism and cube both have only flat surfaces.

Question 2.
only a curved surface

Answer:

Explanation:
Sphere has only a curved surface.

Question 3.
both flat and curved surfaces

Answer:

Explanation:
Cone and cylinder both have flat and curved surfaces.

On Your Own

MATHEMATICAL PRACTICE

Use Models Use three-dimensional shapes.
Write the number of flat surfaces for each shape.

Question 4.
A rectangular prism has __ flat surfaces.

Answer:
A rectangular prism has 6 flat surfaces.

Question 5.
A cube has __ flat surfaces.

Answer:
A cube has 6 flat surfaces

Question 6.
A cylinder has __ flat surfaces.

Answer:
A cylinder has 2 flat surfaces

Question 7.
A sphere has __ flat surfaces

Answer:
A sphere has 0 flat surfaces

GO DEEPER
Write to name each shape.

Question 8.

Question 9.

Answer:

Explanation:
The above given shape is cone.So, write cone.

Question 10.

Answer:

Explanation:
The above shape is cube.So, write cube.

Question 11.

Answer:

Explanation:
The above given shape is cylinder.So, write cylinder.

Question 12.

Answer:

Explanation:
The above givem shape is rectangular prism.So, write rectangular prism.

Problem Solving • Applications

Circle the objects that match the clues

Question 13.
Kelly drew objects that have both flat and curved surfaces.

Answer:

Explanation:
In the above objects the circled objects have both flat and curved surfaces.

Question 14.
Sandy drew some rectangular prisms.

Answer:

Explanation:
The circled objects in the above picture are in the shape of rectangular prisms.

Question 15.
Match each shape to the group where it belongs

Answer:

Explanation:
Cone and cylinder have both flat and curved surfaces, cube and rectangular prism have only flat surfaces an dthe sphere has only a curved surface.

TAKE HOME ACTIVITY
• Ask your child to name real objects shaped like a sphere, a rectangular prism, and a cylinder.

Three-Dimensional Shapes Homework & practice 11.1

Three-Dimensional Shapes

Use three-dimensional shapes. Write the number of flat surfaces for each shape.

Question 1.
A cylinder has __ flat surfaces.

Answer:
A cylinder has 2 flat surfaces.

Question 2.
A rectangular prism has _ flat surfaces.

Answer:
A rectangular prism has 6 flat surfaces.

Go Math Book Grade 1 Chapter 11 Lesson 1 Answer Key Question 3.
A cone has _ flat surface.

Answer:
A cone has 1 flat surface.

Question 4.
A cube has _ flat surfaces.

Answer:
A cube has 6 flat surfaces.

Problem Solving

Question 5.
Circle the object that matches the clue. Mike finds an object that has only a curved surface.

Answer:

Explanation:
Th circled object in the above objects is sphere.A sphere has only a curved surface.

Question 6.
WRITE Math
Use pictures or words to describe a cone.

Answer:

Lesson Check

Question 1.
Circle the shape that has both flat and curved surfaces.

Answer:

Explanation:
The circled shape in the above shapes has both flat and curved surfaces.

Question 2.
Circle the shape that has only a curved surface.

Answer:

Explanation:
The circled shape in the above shapes is a sphere.A sphere has only curved surface.

Spiral Review

Question 3.
Count forward. Write the number that is missing.
109, 110, 111, __, 113

Answer:
109,110,111,112,113.

Explanation:
There is a missing number in between the given number. Count forward.112 comes after 111. So, the missing number is 112.

Go Math Grade 1 Chapter 11 Answer Key Question 4.
What is the sum of 2 and 3? Write the number sentence.

Answer:

Explanation:
When we add 2 and 3, the sum is 5.So, 2+3=5.

Lesson 11.2 Combine Three-Dimensional Shapes

Essential Question
How can you combine three-dimensional shapes to make new shapes?
Answer:
To make new shapes using three-dimensional shapes we have to put the shapes above,below or besides the the other shape so that a new shape will be formed.

Listen and Draw

Trace to draw the new shape. Write to name the new shape.

Answer:

Explanation:
The above shapes are made by combining two shapes. The new shapes are cylinder and rectangular prism.

Math Talk
MATHEMATICAL PRACTICES
Apply to Describe the new shapes Mandy and Carl made.

Model and Draw

You can put shapes together to make a new shape.

Share and Show MATH BOARD

Use three-dimensional shapes.

Answer:

Explanation:
In the above shapes, the circled shapes are the shapes that are made by combining the given shapes beside them.

On Your Own

MATHEMATICAL PRACTICE

Attend to Precision
Use three-dimensional shapes.

Answer:

Explanation:
In the above shapes the circled shapes are the shapes that are made by combing the given shapes besides them.

Problem Solving • Applications WRITE Math

GO DEEPER
Circle the shapes you could use to model the ice cream cone.

Question 9.

Answer:

Explanation:
In the above shapes the circles shapes make the icecream.

Question 10.
Circle the ways that make the same shape.

Answer:

Explanation:
The circled shapes in the above shapes is a cube and is formed by combining cubes.

Question 11.
Combine and .
Choose all the new shapes you can make.

Answer:

Explanation:
The marked shapes in the above picture are formed by combining the two given shapes which are a rectangular prism and a cone.

TAKE HOME ACTIVITY
• Ask your child to show you two different new shapes he or she can make by combining a soup can and a cereal box.

Combine Three-Dimensional Shapes Homework & Practice 11.2

Use three-dimensional shapes.

Answer:

Explanation:.
The circled shapes in the above picture are formed by combing the two given shapes besides them.

Problem Solving

Question 3.
Circle the shapes you could use to model the bird feeder.

Answer:

Explanation:
The circled shapes cone and the cylinder are used to make the model the bird feeder

Go Math Grade 1 Lesson 11.2 Homework Answers Question 4.
WRITE Math
Combine two shapes to make a new shape. Describe how you put the shapes together.
_____________
_____________
_____________
_____________

Answer:
We can put the shapes together by placing the shapes one beside,above or below the other shapes.

Lesson Check

Question 1.
Circle the shape that combines and

Answer:

Explanation:

The circled shapes in the above picture are formed by combing the two given shapes cylinder and cone.

Spiral Review

Question 2.
Write the sum. Write how many tens.
40 + 20 = __ __ tens

Answer:
40+20=60=6 tens

Explanation:
When we add 4 tens and 2 tens we get 6 tens.

Question 3.
Emi has 15 crayons. She gives some crayons to Jo. Now she has 9 crayons. How many crayons did Emi give to Jo? Use the model to solve

__ crayons

Answer:
6 crayons

Explanation:
Emi has 15 crayons. She gives them some crayons to Jo. Now she has 9 crayons. When we subtract 9 from 15 we get 6. So, the number of crayons Emi gave to Jo is 6 crayons.

Lesson 11.3 Make New Three-Dimensional Shapes

Essential Question
How can you use a combined shape to build new shapes?

Listen and Draw

Draw to copy the shape.

Math Talk
MATHEMATICAL PRACTICES
Describe how to draw to copy the new shape.

Model and Draw

Answer:

Explanation:
By repeating the bulided shape we can make the circled shape.We cannot make the other shape because its not like the shape given.

Share and Show MATH BOARD

Use three-dimensional shapes

Answer:

Explanation:
In the above shapes the circled shapes are the shapes that are made by combing the given shapes besides them.

On Your Own

MATHEMATICAL PRACTICE
Use a Concrete Model
Use three-dimensional shapes.

Answer:

Explanation:
In the above shapes the circled shapes are the shapes that are made by combing the given shapes besides them.

Question 7.
THINK SMARTER
Look at the shape.
How many are used to make the shape?

Answer:

Explanation:
The given shape is made by combining the 2 cubes 3 times.

How many are used to make the shape?

Answer:

Explanation:
The given shape is made by combining 1 cube 6 times.

TAKE HOME ACTIVITY
• Ask your child to explain how he or she solved Exercise 4.

Make New Three-Dimensional Shapes Homework & Practice 11.3

Use three-dimensional shapes.

Answer:

Explanation:
In the above shapes, the circled shapes are the shapes that are made by combing the given shapes beside them.

Question:

Answer:

Explanation:
The above shape is formed by repeating the given shape.

Chapter 11 Go Math 1st Grade Dimensional Shapes Question 4.
WRITE Math
Use a cube and a cylinder to build a new shape. Repeat. Draw to show how you can combine these two new shapes to make a larger shape.

Answer:

Explanation:
By drawing a cube and a cylinder and repeating it we can make a larger shape like the above.

Lesson Check

Question 1.
Which new shape can you make? Circle the shape.

Answer:

Explanation:
In the above shapes the circled shapes are the shapes that are made by combing the given shapes above them.

Spiral Review

Question 2.
Which addition fact helps you solve 15 − 6 = ? Write the number sentence.
__ + __ = __

Answer:
6+3=9

Explanation:
When we add 6 and 3 we get the sum 9. Therefore the sum of 6 and 3 is 9.

Question 3.
Which doubles fact helps you solve 5 + 6 = 11?
Circle the number sentence.

Answer:

Explanation:
When we add 5 and 6 we get the sum as 11. The doubles fact 5+5=10 helps us to solve 5+6=11.

Three–Dimensional Geometry Mid-Chapter Check Point

Concepts and Skills

Question 1.
Circle the rectangular prisms.

Question 2.
Draw a line under the shapes that have both flat and curved surfaces.

Answer:

Explanation:
The circled objects in the above picture have both flat and curved surfaces.

Use three-dimensional shapes.

Answer:

Explanation:
The circled object in the above picture is formed by combining the shapes cube and cone.

Question 4.
THINK SMARTER
Which new shape can you make?

Answer:

Explanation:
When we combine and repeat the shape given in the question we get the third shape marked in the above picture.

Lessson 11.4 Problem Solving • Take Apart Three-Dimensional Shapes

Essential Question
How can acting it out help you take apart combined shapes?
Mike has and . He chose some shapes to build a bridge. Which shapes did Mike use to build the bridge?

Unlock the Problem

What do I need to find?

What information do I need to use?
Mike has these shapes.

Show how to solve the problem.

Answer:

Explanation:
The above shape is made by combining the circled shapes cylinder and rectangular prism.

HOME CONNECTION
• Your child is investigating how shapes can be taken apart. Being able to decompose shapes into smaller parts provides a foundation for future work with fractions.

Try Another Problem

Kim used shapes to build this castle.

Use three-dimensional shapes. Circle your answer.

Question 1.
Which shapes did Kim use to build the tower?

Answer:

Explanation:
Kim made the tower by combining the circled shapes cone and a cylinder.

Go Math Grade 1 Chapter 11 Mid Chapter Checkpoint Answer Key Question 2.
Which shapes did Kim use to build this wall?

Answer:

Explanation:
Kim made the wall by combining the circled shapes cube and rectangular prism.

Question 3.
Which shapes did Kim use to build this wall?

Answer:

Explanation:
Kim made the above wall by combining the above circled shapes cylinder and cube.

Question 4.
Which shapes did Kim use to build the gate?

Answer:

Explanation:
Kim bulid the above gate by combining the circled shapes cylinder and rectangular prism.

Math Talk
MATHEMATICAL PRACTICES
Look for Structure How do you know which shapes Kim used to build the tower?

Share and Show MATH BOARD

MATHEMATICAL PRACTICE
Analyze Use three-dimensional shapes. Circle your answer.

Question 5.
Zack used shapes to build this gate. Which shapes did Zack use?

Answer:

Explanation:
zack build the gate by using the circled shapes cone and rectangular prism.

Question 6.
Chris used shapes to build this wall. Which shapes did Chris use?

Answer:

Explanation:
Chris build the above wall by using the circled shapes cylinder,cube and rectangular prism.

Question 7.
THINK SMARTER
Rosa uses and to build a tower. Draw to show a tower Rosa could build.

Answer:

Explanation:
Roscoe and cylinder.a build the tower by using the shapes.

On Your Own

GO DEEPER
Circle the ways that show the same shape.

Question 8.

Answer:

Explanation:
The circled shape in the above pictures is a cube and it is formed by combining cubes only.

Question 9.
THINK SMARTER

Answer:

Explanation:
The circled shape in the above pictures is a cube and it is formed by combining cubes only.

Go Math Workbook Grade 1 Wonders Answer Key Pdf Question 10.
THINK SMARTER
Sharon has many different blocks. She built this shape with her blocks.

Choose all the shapes Sharon used.

Answer:

Explanation:
Sharon made the shapes by using the shapes cube and rectangular prism.

TAKE HOME ACTIVITY
• Use real items such as a soup can (cylinder) and a cereal box (rectangular prism) to build a shape. Ask your child to name the shapes you used.

Problem Solving • Take Apart Three-Dimensional Shapes Homework & Practice 11.4

Use three-dimensional shapes.
Circle your answer.

Question 1.
Paco used shapes to build this robot. Circle the shapes he used.

Answer:

Explanation:
Paco made a robot by using the circled shapes cylinder and rectangular prism.

Problem Solving

Question 2.
Circle the ways that show the same shape.

Answer:

Explanation:
The circled shape in the above picture is a rectangular prism and it is made by combining rectangular prisms only.

Question 3.
WRITE Math
Draw a picture of a house made from shapes. Write the shape names you used.

Answer:

Explanation:
I made a by using some shapes that are cones and rectangular prisms.

Lesson Check

Question 1.
Lara made this picture frame. Circle the shapes she used to make the frame

Answer:

Explanation:
The circled shapes in the above picture are used by Lara to make the picture frame.

Spiral Review

Question 2.
Compare each pair of numbers. Write <, >, or =.

Answer:

Explanation:
In the above picture we used the symbols <,> and = to compare the numbers.
13 is lessthan 31 so, use < symbol to compare
13 is equal to 13 so, use = symbol to compare
31 is greaterthan 13 so, use > symbol to compare
31 isnequal to 31 so, use = symbol to compare.

Question 3.
Subtract. What is the difference? Write the number.
60 – 30 = __

Answer:
60-30=30.

Explanation:
When we subtract 30 from 60 we get 30.3 tens fro 6 tens is 3 tens. Therefore 60-30=30.

Lesson 11.5 Two-Dimensional Shapes on Three-Dimensional Shapes

Essential Question
What two-dimensional shapes do you see on the flat surfaces of three-dimensional shapes?

Listen and Draw

Use a cone.

Math Talk
MATHEMATICAL PRACTICES
Analyze What other shape could you use to draw the same kind of picture?

Answer:
I could have used circle to draw the same kind of picture.

Model and Draw

Trace around the flat surfaces of the three-dimensional shape to find the two-dimensional shapes.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional shapes we get two-dimensional shapes they are square and rectangle.

Share and Show MATH BOARD
Use three-dimensional shapes. Trace around the flat surfaces. Circle the shapes you draw.

Question 1.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional shape cube we get two-dimensional shape that is square.

Go Math Chapter 11 Grade 1 Lesson 11.4 Answer Key Question 2.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional shape cylinder we get two-dimensional shape that is circle.

Question 3.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional shape rectangular prism we get two-dimensional shapes they are square and rectangle.

On Your Own

MATHEMATICAL PRACTICE
Make Connections Circle the objects you could trace to draw the shape.

Question 4.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional object which is circled abovewe get two-dimensional shape that is rectangle.

Question 5.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional objects which are circled above we get two-dimensional shape that is circle.

Question 6.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional objects which are circled above we get two-dimensional shape that is square.

Question 7.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional object which is circled abovewe get two-dimensional shape that is rectangle.

Question 8.
THINK SMARTER
Draw a shape you would make if you traced this object.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional shape which is given above we get two-dimensional shape that is triangle.

Problem Solving • Applications

Circle the shape that the pattern will make if you fold it and tape it together.

Question 9.

Answer:

Explanation:
If we fold the above given pattern we get the three-dimensional shape that is rectangular prism.

Go Math Chapter 11 Grade 1 Review/Test Answer Key Question 10.

Answer:

Explanation:
If we fold the above given pattern we get the three-dimensional shape that is cube.

Question 11.
THINK SMARTER
Kei wants to trace a She finds these objects. Which object should she use?

Answer:

Explanation:
Kie wants to trace a rectangle.If he trace the flat surfaces of the gift box which is circled above he gets a two-dimensional shape rectangle.
What would happen if Kei used the to trace a shape?

Answer:

Explanation:
If kie trace the above given object he gets the two-dimensional shape that is circle.

TAKE HOME ACTIVITY
• Collect a few three-dimensional objects, such as boxes, that are shaped like rectangular prisms or cubes. Ask your child what two-dimensional shapes are on those objects.

Two-Dimensional Shapes on Three-Dimensional Shapes Homework & Practice 11.5

Circle the objects you could trace to draw the shape.

Question 1.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional objects which are circled above we get two-dimensional shape that is rectangle.

Question 2.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional objects which are circled above we get two-dimensional shape that is circle.

Problem Solving

Question 3.
Look at this shape. Draw the shape you would make if you traced this object.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional object which is given above we get two-dimensional shape that is circle.

Question 4.
WRITE Math
Use pictures or words to explain how you would describe the shapes of flat surfaces you may see on a tissue box.

Answer:

Lesson Check

Question 1.
Which flat surface does a cone have? Circle the shape.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional object cone which is mentioned above we get the two-dimensional shape that is a circle.

Go Math Grade 1 Chapter 11 Lesson 11.5 Question 2.
Which flat surfaces could a rectangular prism have? Circle the pair of shapes.

Answer:

Explanation:
When we trace around the flat surfaces of the three-dimensional object rectangular prism which is mentioned above we get two-dimensional shape that is rectangle and square.

Spiral Review

Write a subtraction sentence to solve.

Question 3.
Jade has 8 books. She gives some of them to Dana. Now Jade has 6 books. How many did she give to Dana?
__ – __ = __
__ books

Answer:
8-6=2
2 books

Explanation:
Jade has 8 books. She gives some of them to Dana. Now Jade has 6 books.
8-6=2
Therefore, the number of books she give to Dana are 2.

Question 4.
Write the sum.
3 + 0 = __

Answer:
3+0=3

Explanation:
If we add any number with zero we get the sum same as the number we added.

Three–Dimensional Geometry Chapter 11 Review/Test

Question 1.
Match each shape to the group where it belongs.

Answer:

Explanation:
The shapes that have only flat surfaces are cube and rectangular prism
The shape that has only a curved surface is a sphere
The shapes that have both flat and curved surfaces are cone and cylinder.

Question 2.
Combine and Choose all the new shapes you can make.

Answer:

Explanation:
The marked shapes in the above picture can be made by joining the shapes cube and cylinder given above.

Question 3.
Build and repeat. Choose Yes or No.

Answer:

Question 4.
Damon built this shape.

Choose all the shapes Damon used.

Answer:

Explanation:
Demon used the marked shapes cube and cone to build the shape given above.

Question 5.
Circle the number that makes the sentence true

Answer:

Explanation:
When we trace the flat surface of the three-dimensional shape cone we get a two-dimensional shape that is circle.

Question 6.
GO DEEPER
Sara wants to trace a . She finds these objects.

Which object should she use?

Answer:

Explanation:
When sara trace the flat surface of the shape given above he will get the two-dimensionla shape that is circle.

What would happen if she used the to trace a shape?

Answer:

Question 7.
Which shape has only 2 flat surfaces?

Answer:

Explanation:
In the above given shapes, the marked shape cylinder has 2 flat surfaces.

Chapter 11 Grade 1 Go Math Answer Key Pdf Question 8.
Look at the shape.

How many are used to make the shape?

Answer:

Explanation:
We need 3 to make the above shape.

Question 9.
Ellen built this shape.

Which objects did Ellen use? Circle them.

Answer:

Explanation:
Ellen used the above circled shapes cylinder and rectangular prism to build the shape given.

Draw another way to combine the objects

Answer:

Explanation:
When we combine the two shapes cylinder and rectangular prism we can also build another shape mentioned above.

Grade 1 Go Math Chapter 11 Review/Test Question 10.
THINK SMARTER
Hector built this shape.

Choose all the shapes Hector used

Answer:

Explanation:
Hector build the above shape by using the marked shapes from the picture given they are cone, cube and cylinder.

Go Math Grade 1 Chapter 8 Answer Key Pdf: Elementary School Kids will feel the math concepts enjoyable to learn and teach by referring to our Go Math Grade 1 Answer Key Chapter 8 Two-Digit Addition and Subtraction. HMH Go Math Grade 1 Answers are thoughtfully constructed with an intense focus on key concepts of the Grade 1 Curriculum. Deepen your knowledge and enhance your math proficiency by learning the problem-solving approach from First Grade Go Math Chapter 8 Two-Digit Addition and Subtraction Answer Key.

Two-Digit Addition and Subtraction Go Math Grade 1 Chapter 8 Answer Key Pdf

With consistent practice from the HMH Go Math 1st Grade Ch 8 Solutions you can gain a complete body of math knowledge other than a discrete set of skills. Topicwise Go Math Grade 1 Chapter 8 Answer Key will create enduring knowledge that will stay with you from grade to grade. Look no further! and begin your preparation taking the help of the quick links available below. Simply click on the quick links to avail the respective topics within them easily.

Two-Digit Addition and Subtraction

• Two-Digit Addition and Subtraction Show What You Know – Page 434
• Two-Digit Addition and Subtraction Vocabulary Builder – Page 435
• Two-Digit Addition and Subtraction Game Neighborhood Sums – Page 436

Lesson: 1 Add and Subtract Within 20

• Lesson 8.1 Add and Subtract Within 20 – Page(437-442) 
• Add and Subtract Within 20 Homework & Practice 8.1 – Page(441-442)

Lesson: 2 Add Tens

• Lesson 8.2 Add Tens – Page(449-454)
• Add Tens Homework & Practice 8.2 – Page(453-454)

Lesson: 3 Subtract Tens

• Lesson 8.3 Subtract Tens – Page(449-454)
• Subtract Tens Homework & Practice 8.3 – Page(453-454)

Mid-Chapter Checkpoint

• Two-Digit Addition and Subtraction Mid-Chapter Checkpoint – Page 452

Lesson: 4 Use a Hundred Chart to Add

• Lesson 8.4 Use a Hundred Chart to Add – Page(455-460)
• Use a Hundred Chart to Add Homework & Practice 8.4 – Page(459-460)

Lesson: 5 Use Models to Add

• Lesson 8.5 Use Models to Add – Page(461-466)
• Use Models to Add Homework & Practice 8.5 – Page(465-466)

Lesson: 6 Make Ten to Add

• Lesson 8.6 Make Ten to Add – Page(467-472)
• Make Ten to Add Homework & Practice 8.6 – Page(471-472)

Lesson: 7 Use Place Value to Add

• Lesson 8.7 Use Place Value to Add – Page(473-478)
• Use Place Value to Add Homework & Practice 8.7 – Page(477-478)

Lesson: 8 Problem Solving • Addition Word Problems

• Lesson 8.8 Problem Solving • Addition Word Problems – Page(479-484)
• Problem Solving • Addition Word Problems Homework & Practice 8.8 – Page(483-484)

Lesson: 9 Related Addition and Subtraction

• Lesson 8.9 Related Addition and Subtraction – Page(485-490)
• Related Addition and Subtraction Homework & Practice 8.9 – Page(489-490)

Lesson: 10 Practice Addition and Subtraction

• Lesson 8.10 Practice Addition and Subtraction – Page(491-496)
• Practice Addition and Subtraction Homework & Practice 8.10 – Page(495-496)
• Two-Digit Addition and Subtraction Review/Test – Page(497-500)

Two-Digit Addition and Subtraction Show What You Know

Add and Subtract
Use and to add. Write the sum.
Break apart to subtract.
Write the difference.
Question 1.

Answer:

Explanation:
Given 4 red cubes and 1 blue cubes
In the first expression 4 red cubes + 1 blue cubes gives the sum 5.
In the second expression sum 5  – 1 blue cube gives the difference 4.

Count Groups to 20
Circle groups of 10. Write how many.
Question 2.

Answer:

Explanation:
Their are total 14 stars. 7 in first row and another 7 in second row.
To get the total of 10 we need to circle 7 in row and 3 in the second row.

Question 3.

Answer:

Answer:
5 stars  +  5 stars = 10 stars.
Explanation:
Given total 12 stars
5 in first row , 2 in second row, 5 in third row.
Adding 5 and 5 gives the sum 10.
5 + 5 = 10.

Use a Hundred Chart to Count
Touch and count. Shade the last number counted.

Question 4.
Start at 1 and count to 20.
Answer:

Explanation:
start from 1.
From 1 count on ten ones to 10 and from 10 count on one tens to 20. We get the required answer 1 to 20.

Question 5.
Start at 30 and count to 56.
Answer:

Start at 30 count on two tens to 50. From 51 count on six ones to reach 56.
Explanation:
To reach from 30 to 56
we need to count on two tens from 30 to 40, 40 to 50 and six ones from 51 to 52, 52 to 53, 53 to 54, 54 to 55, 55 to 56.

Question 6.
Start at 77 and count to 93.
Answer:

Explanation:
Start from 77 count on 3 ones to 80.
77 to 78, 78 to 79, 79 to 80
Start from 80 count on 1 tens to 90.
80 to 90
From 91 count on 3 ones to 93.
91 to 92, 92 to 93.

Two-Digit Addition and Subtraction Vocabulary Builder

Visualize It
Sort the review words from the box.

Answer:

Understand Vocabulary
Use a review word to complete each sentence.
Question 1.
8 is the _____ for 17 _____ 9.
Answer:
8 is the difference for 17 subtract 9.

Question 2.
17 is the _____ for 8 + 9.
Answer:
17 is the sum for 8 + 9.

Question 3.
When you _____ 4 to 8, you find the sum.
Answer:
When you add 4 to 8, you find the sum.

Question 4.
When you _____ 4 from 8, you find the difference.
Answer:
When you subtract 4 from 8, you find the difference.

Two-Digit Addition and Subtraction Game Neighborhood Sums

Materials

Play with a partner.

• Put your on START.
• Spin the . Move that number of spaces.
• Make a ten to help you find the sum.
• The other player uses to check.
• If you are not correct, you lose a turn.
• The first player to get to END wins.
  

Two-Digit Addition and Subtraction Vocabulary Game

Materials
1 set of word cards

• 18 https://gomathanswerkey.com/wp-content/uploads/2021/02/1st-Grade-Go-Math-Answer-Key-Chapter-8-Two-Digit-Addition-and-Subtraction-2.4.png” alt=”1st Grade Go Math Answer Key Chapter 8 Two-Digit Addition and Subtraction 2.4″ width=”40″ height=”36″ class=”alignnone size-full wp-image-12779″ />

How to Play
Play with a partner.

1. Mix the cards. Put the cards in a pile with the blank side up.
2. Take a card. Read the word.
3. Find the matching word on your Bingo board. Cover the word with a . Put the card at the bottom of the pile.
4. The other player takes a turn.
5. The first player to cover 3 spaces in a line wins. The line may go across or down.
   

The Write Way
Reflect
Choose one idea. Draw and write about it.

• Write sentences that include at least two of these terms.
  add subtract addition sentence subtraction sentence
• Explain how you would solve this problem.
  53 + 20 = _____
  

Lesson 8.1 Add and Subtract Within 20

Essential Question What strategies can you use to add and subtract?

Listen and Draw

What is 5 + 4? Use a strategy to solve the addition fact. Draw to show your work.

5 + 4 = _____
Answer:
5 + 4 = 9
5 + 4 is a addition sentence where 5 and 4 add to give the sum 9.

MATHEMATICAL PRACTICES
Apply What strategy did you use to find the answer?
Answer:
Related fact.

Share and Show

Add or subtract.
Question 1.
5 + 3 = _____
Answer:
5 + 3 = 8.
Explanation:
Given addition expression adding  5 and 3 gives the sum 8.

1st Grade Go Math Topic 8 Lesson 8.1 Question 2.
10 – 5 = _____
Answer:
10 – 5 = 5.
Explanation:
Given a subtraction expression subtracting 5 from 10 gives the difference 5.
5 + 5 = 10 adding the difference and the subtrahend gives the minuend.

Question 3.
3 + 6 = ____
Answer:
3 + 6 = 9
Explanation:
Given addition expression adding  3 and 6 gives the sum 9.

Question 4.
12 – 5 = ____
Answer:
12 – 5 = 7.
Explanation:
Given a subtraction expression subtracting 5 from 12 gives the difference 7.
7 + 5 = 12 adding the difference and the subtrahend gives the minuend.

Question 5.
15 – 9 = ____
Answer:
15 – 9 = 6.
Explanation:
Given a subtraction expression subtracting 9 from 15 gives the difference 6.
9 + 6 = 15 adding the difference and the subtrahend gives the minuend.

Question 6.
5 + 7 = ____
Answer:
5 + 7 = 12
Explanation:
Given addition expression adding  5 and 7 gives the sum 12.

Question 7.
8 + 7 = ____
Answer:
8 + 7 = 15.
Explanation:
Given addition expression adding  8 and 7 gives the sum 15.

Question 8.
9 – 7 = ____
Answer:
9 – 7 = 2
Explanation:
Given a subtraction expression subtracting 7 from 9 gives the difference 2.
2 + 7 = 9 adding the difference and the subtrahend gives the minuend.

Question 9.
5 + 5 = ___
Answer:
5 + 5 = 10
Explanation:
Given the addition expression adding  5  and 5 gives the sum 10.

Go Math 1st Grade Chapter 8 Lesson 8.1 Question 10.
12 – 7 = ____
Answer:
12 – 7 = 5
Explanation:
Given a subtraction expression subtracting 7 from 12 gives the difference 5.
5 + 7 = 12 adding the difference and the subtrahend gives the minuend.

Question 11.
18 – 9 = ____
Answer:
18 – 9 = 9
Explanation:
Given a subtraction expression subtracting 9 from 18 gives the difference 9.
9 + 9 = 18 adding the difference and the subtrahend gives the minuend.

Question 12.
9 + 4 = ____
Answer:
9 + 4 = 13
Explanation:
Given addition expression adding  9 and 4 gives the sum 13.

Question 13.
2 + 7 = ___
Answer:
2 + 7 = 9
Explanation:
Given addition expression adding  2  and 7 gives the sum 9.

Question 14.
5 – 1 = ____
Answer:
5 – 1 = 4.
Explanation:
Given a subtraction expression subtracting 1 from 5 gives the difference 4.
1 + 4 = 5 adding the difference and the subtrahend gives the minuend.

Question 15.
9 + 1 = ____
Answer:
9 + 1 = 10
Explanation:
Given addition expression adding  9 and 1 gives the sum 10.

Question 16.
7 – 6 = ____
Answer:
7 – 6 = 1
Explanation:
Given a subtraction expression subtracting 6 from 7 gives the difference 1.
1 + 6 = 7 adding the difference and the subtrahend gives the minuend.

Question 17.
13 – 4 = ____
Answer:
13 – 4 = 9
Explanation:
Given a subtraction expression subtracting 4 from 13 gives the difference 9.
9 + 4 = 13 adding the difference and the subtrahend gives the minuend.

Question 18.
2 + 6 = ____
Answer:
2 + 6 = 8
Explanation:
Given addition expression adding  2 and 6 gives the sum 8.

On Your Own

MATHEMATICAL PRACTICE Apply Add or subtract.
Question 19.

Answer:
14 – 5 = 9
Explanation:
Given a subtraction expression subtracting 5 from 14 gives the difference 9.
9 + 5 = 14 adding the difference and the subtrahend gives the minuend.

Question 20.

Answer:
2 + 10 = 12
Explanation:
Given addition expression adding  2 and 10 gives the sum 12.

Go Math Grade 1 Lesson 8.1 Chapter 8 Answer Key Question 21.

Answer:
3 + 3 = 6
Explanation:
Given addition expression adding  3 and 3 gives the sum 6.

Question 22.

Answer:
14 – 8 = 6
Explanation:
Given a subtraction expression subtracting 8 from 14 gives the difference 6.
6 + 8 = 14 adding the difference and the subtrahend gives the minuend.

Question 23.

Answer:
8 + 9 = 17
Explanation:
Given addition expression adding  8 and 9 gives the sum 17.

Question 24.

Answer:
6 – 3 = 3
Explanation:
Given a subtraction expression subtracting 3 from 6 gives the difference 3.
3 + 3 = 6 adding the difference and the subtrahend gives the minuend.

Question 25.

Answer:
6 – 5 = 1
Explanation:
Given a subtraction expression subtracting 5 from 6 gives the difference 1.
1 + 5 = 6 adding the difference and the subtrahend gives the minuend.

Question 26.

Answer:
2 + 8 = 10
Explanation:
Given addition expression adding  2 and 8 gives the sum 10.

Question 27.

Answer:
0 + 5 = 5
Explanation:
Given addition expression adding  0 and 5 gives the sum 5.
Adding any number to zero gives the sum the number itself.

Question 28.

Answer:
10 – 2 = 8
Explanation:
Given a subtraction expression subtracting 2 from 10 gives the difference 8.
8 + 2 = 10 adding the difference and the subtrahend gives the minuend.

Question 29.

Answer:
9 + 9 = 18
Explanation:
Given addition expression adding  9 and 9 gives the sum 18.

Question 30.

Answer:
5 – 4 = 1
Explanation:
Given a subtraction expression subtracting 4 from 5 gives the difference 1.
1 + 4 = 5 adding the difference and the subtrahend gives the minuend.

Question 31.

Answer:
8 – 8 = 0
Explanation:
Given a subtraction expression subtracting 8 from 8 gives the difference 0.
0 + 8 = 8 adding the difference and the subtrahend gives the minuend.

Question 32.

Answer:
10 + 1 = 11
Explanation:
Given addition expression adding  10 and 1 gives the sum 11.

Question 33.

Answer:
4 + 7 = 11
Explanation:
Given addition expression adding  4 and 7 gives the sum 11.

Question 34.

Answer:
9 – 3 = 6
Explanation:
Given a subtraction expression subtracting 3 from 9 gives the difference 6.
6 + 3 = 9 adding the difference and the subtrahend gives the minuend.
Question 35.

Answer:
1 + 8 = 9.
Explanation:
Given addition expression adding  1 and 8 gives the sum 9.

Question 36.

Answer:
17 – 9 = 8
Explanation:
Given a subtraction expression subtracting 9 from 17 gives the difference 8.
8 + 9 = 17 adding the difference and the subtrahend gives the minuend.
Question 37.

Answer:
13 – 7 = 6.
Explanation:
Given a subtraction expression subtracting 7 from 13 gives the difference 6.
6 + 7 = 13 adding the difference and the subtrahend gives the minuend.

Go Math 1st Grade Show The 1 Digit Addition Sentence Question 38.

Answer:
6 + 5 = 11
Explanation:
Given addition expression adding  6 and 5 gives the sum 11.

Question 39.

Answer:
10 + 2 = 12.
Explanation:
Given addition expression adding  2 and 10 gives the sum 12.

Question 40.

Answer:
14 – 9 = 5.
Explanation:
Given a subtraction expression subtracting 9 from 14 gives the difference 5.
5 + 9 = 14 adding the difference and the subtrahend gives the minuend.

Question 41.

Answer:
10 + 10 = 20
Explanation:
Given addition expression adding  10 and 10 gives the sum 20.

Question 42.

Answer:
11 – 3 = 8
Explanation:
Given a subtraction expression subtracting 3 from 11 gives the difference 8.
8 + 3 = 11 adding the difference and the subtrahend gives the minuend.

Question 43.
THINK SMARTER
Jamal thinks of an addition fact. The sum is 15. One addend is 8. What is a fact Jamal could be thinking of?

Answer:
Given
Sum = 15
1st addend is = 8
2nd addend = sum – 1st addend
15- 8 = 7.
7 is the 2nd addend.
7 + 8 = 15.

Problem Solving • Applications

Solve. Write or draw to explain.
Question 44.
THINK SMARTER
There are 9 ants on a rock. Some more ants get on the rock. Now there are 18 ants on the rock. How many more ants got on the rock?

______ more ants
Answer:
Given:
Number of ants on the rock at first = 9 ants
Total number of  after adding some more ants on the rock = 18 ants
Number of ants that got on the rock = total – number of ants at first
18 – 9 = 9 ants.
9 more ants got added to the rock.
9 ants + 9 ants = 18 ants.

Question 45.
GO DEEPER
Fill in the blanks. Write a number sentence to solve. Lin sees _____ bees. Some bees flew away. Now there are _____ bees. How many bees flew away?

______ bees
Answer:
Assume:
Total number of bees Lin sees= 10 bees.
Number of bees after some flew away = 5 bees
Number of bees flew away = total bees – number of bees after some flew away
10 – 5 = 5 bees.

Question 46.
THINK SMARTER
Write each addition or subtraction in the box below the answer

Answer:

TAKE HOME ACTIVITY • Have your child tell a strategy he or she would use to solve 4 + 8.

Add and Subtract Within 20 Homework & Practice 8.1

Add or subtract.
Question 1.

Answer:
6 + 0 = 6
Explanation:
Given addition expression adding  10 and 10 gives the sum 20.

Question 2.

Answer:
11 – 2 = 9
Explanation:
Given a subtraction expression subtracting 2 from 11 gives the difference 9.
9 + 2 = 11 adding the difference and the subtrahend gives the minuend.

Question 3.

Answer:
4 + 5 = 9
Explanation:
Given addition expression adding  4 and 5 gives the sum 9.

Question 4.

Answer:
9 + 8 = 17
Explanation:
Given addition expression adding  9 and 8 gives the sum 17.

Question 5.

Answer:
4 + 10 = 14
Explanation:
Given addition expression adding  4 and 10 gives the sum 14.

Question 6.

Answer:
14 – 9 = 5
Explanation:
Given a subtraction expression subtracting 9 from 14 gives the difference 5.
5 + 9 = 14 adding the difference and the subtrahend gives the minuend.

Question 7.

Answer:
7 + 4 = 13
Explanation:
Given addition expression adding  7 and 4 gives the sum 13.

Question 8.

Answer:
8 – 5 = 3
Explanation:
Given a subtraction expression subtracting 5 from 8 gives the difference 3.
5 + 3 = 8 adding the difference and the subtrahend gives the minuend.

Question 9.

Answer:
10 – 1 0 = 0
Explanation:
Given a subtraction expression subtracting 10 from 10 gives the difference 0.
10 + 0 = 10 adding the difference and the subtrahend gives the minuend.

Question 10.

Answer:
6 + 7 = 13
Explanation:
Given addition expression adding  6 and 7 gives the sum 13.

Question 11.

Answer:
18 – 9 = 9
Explanation:
Given a subtraction expression subtracting 9 from 18 gives the difference 9.
9 + 9 = 18 adding the difference and the subtrahend gives the minuend.

Question 12.

Answer:
15 – 6 = 9
Explanation:
Given a subtraction expression subtracting 6 from 15 gives the difference 9.
9 + 6 = 15 adding the difference and the subtrahend gives the minuend.

Problem Solving
Solve. Draw or write to explain.
Question 13.
Jesse has 4 shells. He finds some more. Now he has 12 shells. How many more shells did Jesse find?
_______ more shells
Answer:
Number of shells Jesse had at first = 4 shells
After finding some more
Total number of shells Jesse have =12 shells
Number of shells Jesse find= Total shells – number of shells at first
12 – 4 = 8
Jesse found 8 more shells.

Question 14.
WRITE
Write an addition and subtraction fact. Then write a strategy you could use to solve the fact.
__________________
___________________
Answer:
8 + 9 = 17
9 – 8 = 1
The strategy i used to solve it is related fact.

Lesson Check
Question 1.
What is the sum? Write the number.
8 + 5 = ______
Answer:
8 + 5 = 13
13 is the SUM.
Explanation:
Sum is the result of adding two or more numbers.
8 and 5 are two number which are added to get the sum 13.

Question 2.
What is the difference? Write the number.
11 – 4 = ______
Answer:
11 – 4 = 7
7 is the difference between 11 and 4.
Explanation:
Difference is the result of subtracting one number from another.
4 is subtracted from 11 and got the difference 7.

Spiral Review
Question 3.

Answer:

Explanation:
46 is greater than 43.
Both the numbers are in the same tens place of four. But the ones place are the different first one is at 3 and the other is at 6 . Since 6 is greater then 3. 46 is greater than 43.

Question 4.

Answer:

Explanation:
Given two number
69 – its at 6 tens and 9 ones
84- its at 8 tens and 4 ones
as per the above 69 is less then 84 as it is 2 tens less than 84.

Lesson 8.2 Add Tens

Essential Question How can you add tens?

Listen and Draw

Choose a way to show the problem. Draw a quick picture to show your work.

MATHEMATICAL PRACTICES
Reasoning Why will there be no ones in your answer when you add 20 + 30?
Answer:
There are no ones when we add 20 and 30 because they both are in tens places and there is no ones place in both the number.
20 + 30 = 50

Model and Draw

How can you find 30 + 40?

Answer:

Share and Show

Use . Draw to show tens. Write the sum. Write how many tens.
Question 1.
20 + 40 = ______
_____ tens
Answer:

Explanation:
ONE line represents tens
1 line = 10
20 + 40 = 60
60 = 6 lines

Question 2.
30 + 30 = ______
______ tens
Answer:
30 + 30 = 60
Each line represents 1 Tens.

Explanation:
ONE line represents tens
1 line = 10
30 + 30 = 60
60 = 6 lines

Question 3.
40 + 50 = ______
_____ tens
Answer:
40 + 50 = 90
Each line represents Tens.

Explanation:
ONE line represents tens
1 line = 10
40 + 50 = 90
90 = 9 lines

Go Math Grade 1 Lesson 8.2 Answer Key Question 4.
50 + 30 = _____
_____ tens
Answer:
50 + 30 = 80
Each line represents Tens.

Explanation:
ONE line represents tens
1 line = 10
50 + 30 = 80
80 = 8 lines

On Your Own

MATHEMATICAL PRACTICE Represent a Problem Draw to show tens. Write the sum. Write how many tens.
Question 5.
40 + 40 = _____
____ tens
Answer:
40 + 40 = 80

Explanation:
ONE line represents tens
1 line = 10
40 + 40 = 80
80 = 8 lines

Question 6.
70 + 20 = _____
______ tens
Answer:
70 + 20 = 90

Explanation:
ONE line represents tens
1 line = 10
70 + 20 = 90
90 = 9 lines

Question 7.
10 + 80 = _____
_____ tens
Answer:
10 + 80 = 90

Explanation:
ONE line represents tens
1 line = 10
10 + 80 = 90
90 = 9 lines

Question 8.
60 + 80 = _____
_____ tens
Answer:
60 + 80 = 140

Explanation:
ONE line represents tens
1 line = 10
60 + 80 = 140
140 = 14 lines

Question 9.
GO DEEPER
Draw two groups of tens you can add to get a sum of 50. Write the number sentence.

Answer:
We can represent a group of tens that add together to a sum of 50 in different ways as below.
20 + 30 = 50
10 + 40 = 50
These two-number sentences gives the sum 50 on adding two  groups of tens.

Problem Solving • Applications

Question 10.
THINK SMARTER
Complete the web. Write the missing addend to get a sum of 90.

Answer:

Question 11.
THINK SMARTER
Choose all the ways that name the model.

Answer:
7 Tens
70

TAKE HOME ACTIVITY • Ask your child to explain how to use tens to find 20 + 70.

Add Tens Homework & Practice 8.2

Draw to show tens. Write the sum. Write how many tens.
Question 1.
10 + 30 = ____
_____ tens
Answer:
10 + 30 = 40

Explanation:
ONE line represents tens
1 line = 10
10 + 30 = 40
40 = 4 lines

Question 2.
30 + 30 = _____
____ tens
Answer:
30 + 30 = 60

Explanation:
ONE line represents tens
1 line = 10
30 + 30 = 60
60 = 6 lines

Question 3.
60 + 10 = _____
_____ tens
Answer:
60 + 10 = 70

Explanation:
ONE line represents tens
1 line = 10
60 + 10 = 70
70 = 7 lines

Go Math Grade 1 Chapter 8 Pdf Question 4.
10 + 70 = _____
_____ tens
Answer:
10 + 70 = 80

Explanation:
ONE line represents tens
1 line = 10
70 + 10 = 80
80 = 8 lines

Problem Solving
Draw tens to solve.
Question 5.
Drew makes 20 posters. Tia makes 30 posters. How many posters do they make?
______ posters
Answer:
Number of posters Drew made = 20
Number of posters Tia made = 30
Total number of posters both Drew and Tia make = Number of posters made by Drew + Number of posters made by Tia
20 + 30 = 50
Total 50 posters made by both.

Question 6.
Regina read 40 pages. Alice read 50 pages. How many pages did they read?
______ pages
Answer:
Number of pages Regina read = 40
Number of pages read by Alice = 50
Total number of pages read by both = Number of pages read by Regina + Number of pages read by Alice
40 + 50 = 90
Total 90 pages read by both.

Question 7.
WRITE
Choose an addition problem from the spider web on page 446. Draw a quick picture and write the number sentence.
Answer:

I choose 70 + 20 = 90

Explanation:
ONE line represents tens
1 line = 10
70 + 20 = 90
90 = 9 lines

Lesson Check
Question 1.
What is the sum? Write the number.
20 + 30 = _____
Answer:
20 + 30 = 50

Explanation:
ONE line represents tens
1 line = 10
20 + 30 = 50
50 = 5 lines

Question 2.
What is the sum? Write the number.
30 + 10 = _____
Answer:
30 + 10 = 40

Explanation:
ONE line represents tens
1 line = 10
30 + 10 = 40
40 = 4 lines

Spiral Review
Question 3.
Write a doubles fact that can help you solve 6 + 5 = 11
___ + ___ = _____
Answer:
6 + 5 = 11
(3 +3) + (3 + 3 ) = 11
6 + 6 =11
12 =11
The above expression is doubles minus 1

Question 4.
Circle the number sentences that are true. Cross out the number sentences that are false. Which is not true?
30>10
30<10
10>30
10<30
Answer:

Lesson 8.3 Subtract Tens

Essential Question How can you subtract tens?

Listen and Draw

Choose a way to show the problem. Draw a quick picture to show your work.

MATHEMATICAL PRACTICES
Represent How does your picture show the first problem?
Answer:

Model and Draw

How can you find 80 – 30

Answer:

Share and Show

Use . Draw to show tens. Write the difference. Write how many tens.
Question 1.
60 – 20 = ____
_____ tens
Answer:
60 – 20 = 40

Explanation:
We subtract the subtrahend from the minuend to get the difference.
60 – 20 = 40
60 is minuend and 20 is subtrahend and 40 is difference of both
ONE line represents tens
1 line = 10
60 – 20 = 40
40 = 4 lines

Question 2.
70 – 30 = ____
_____ tens
Answer:
70 – 30 = 40

Explanation:
We subtract the subtrahend from the minuend to get the difference.
70 – 30 = 40
70 is minuend and 300 is subtrahend and 40 is a difference of both
ONE line represents tens
1 line = 10
70 – 30 = 40
40 = 4 lines

Question 3.
80 – 20 = ____
____ tens
Answer:
80 – 20 = 60

Explanation:
We subtract the subtrahend from the minuend to get the difference.
80 – 20 = 60
80 is minuend and 20 is subtrahend and 60 is difference of both
ONE line represents tens
1 line = 10
80 – 20 = 60
60 = 6 lines

Question 4.
90 – 40 = ____
____ tens
Answer:
90 – 40 = 50

Explanation:
We subtract the subtrahend from the minuend to get the difference.
90 – 40 = 50
90 is minuend and 40 is subtrahend and 50 is difference of both
ONE line represents tens
1 line = 10
90 – 40  = 50
50 = 5 lines

On Your Own

MATHEMATICAL PRACTICE Make Connections Draw to show tens. Write the difference. Write how many tens.
Question 5.
80 – 40 = ____
____ tens
Answer:

Explanation:
We subtract the subtrahend from the minuend to get the difference.
80 – 40 = 40
80 is minuend and 40 is subtrahend and 40 is difference of both
ONE line represents tens
1 line = 10
80 – 40  = 40
40 = 4 lines

Question 6.
90 – 70 = ____
____ tens
Answer:

Explanation:
We subtract the subtrahend from the minuend to get the difference.
90 – 70 = 20
90 is minuend and 70 is subtrahend and 20 is difference of both
ONE line represents tens
1 line = 10
90 – 70  = 20
20 = 2 lines

Question 7.
70 – 50 = ____
____ tens
Answer:

Explanation:
We subtract the subtrahend from the minuend to get the difference.
70 – 50 = 20
70 is minuend and 50 is subtrahend and 20 is difference of both
ONE line represents tens
1 line = 10
70 – 50  = 20
20 = 2 lines

Question 8.
30 – 30 = ____
____ tens
Answer:

Explanation:
We subtract the subtrahend from the minuend to get the difference.
30 – 30 = 0
30 is minuend and 30 is subtrahend and 0 is difference of both
ONE line represents tens
1 line = 10
30 – 30 = 0
0 = 0 lines

THINK SMARTER Solve.
Question 9.
Jeff has 40 pennies. He gives some to Jill. He has 10 pennies left. How many pennies does Jeff give to Jill?

______ pennies
Answer:
Number of pennies Jeff has = 40 pennies
After giving some to Jill
Number of pennies left with Jeff = 10 pennies
Number of pennies Jeff gave to Jill = number of pennies Jeff had – Number of pennies left after giving to Jill
40 – 10 = 30 pennies.

TAKE HOME ACTIVITY • Ask your child to explain how to use tens to find 90 − 70.

Subtract Tens Homework & Practice 8.3

Draw to show tens. Write the difference. Write how many tens.
Question 1.
40 – 10 = ______
____ tens
Answer:
40 – 10 = 30

Explanation:
We subtract the subtrahend from the minuend to get the difference.
40 – 10 = 30
40 is minuend and 10 is subtrahend and 30 is difference of both
ONE line represents tens
1 line = 10
40 – 10 = 30
30 = 3 lines

Question 2.
80 – 40 = ____
____ tens
Answer:

Explanation:
We subtract the subtrahend from the minuend to get the difference.
80 – 40 = 40
80 is minuend and 40 is subtrahend and 40 is difference of both
ONE line represents tens
1 line = 10
80 – 40 = 0
40 = 4 lines

Problem Solving
Draw tens to solve.
Question 3.
Mario has 70 baseball cards. He gives 30 to Lisa. How many baseball cards does Mario have left?
______ baseball cards
Answer:
Total number of baseball cards Mario has = 70
Number of cards he gave to Lisa = 30
Number of baseball cards left with Mario = Total cards – Number of cards he gave to Lisa
70 – 30 = 40 left.

Question 4.
WRITE
Draw a picture to show how to solve 50 – 40.
Answer:
50 – 40 = 10

Explanation:
We subtract the subtrahend from the minuend to get the difference.
50 – 40 = 10
30 is minuend and 30 is subtrahend and 0 is difference of both
ONE line represents tens
1 line = 10
50 – 40 = 10
10 = 1 lines

Lesson Check
Question 1.
What is the difference? Write the number.
60 – 20 = ____
Answer:
60 -20 = 40

Explanation:
We subtract the subtrahend from the minuend to get the difference.
60 – 20 = 40
60 is minuend and 20 is subtrahend and 40 is difference of both
ONE line represents tens
1 line = 10
60 – 20 = 40
40 = 4 lines

Go Math Chapter 8 Grade 1 Show The 1 Digit Addition Sentence Question 2.
What is the difference? Write the number.
70 – 30 = ____
Answer:
70 – 30 = 40

Explanation:
We subtract the subtrahend from the minuend to get the difference.
70 – 30 = 40
70 is minuend and 30 is subtrahend and 40 is difference of both
ONE line represents tens
1 line = 10
70 – 30 = 40
40 = 4 lines

Spiral Review
Question 3.
Use ◯, , and a ten frame. Show both addends. Draw to make ten. Then write a new fact. Add.

Answer:

Question 4.
Bo crosses out the number cards that are less than 33 and greater than 38. What numbers are left?

Number cards _____ and _____ are left.
Answer:

36 , 37 are the number cards that are left.

Two-Digit Addition and Subtraction Mid-Chapter Checkpoint

Concepts and Skills

Add or subtract.
Question 1.

Answer:
4 + 8 = 12
Explanation:
Given addition sentence 4 and 8 are addends. when we add both the addend we get the sum
4 + 8 = 12
12 is the sum

Question 2.

Answer:
15 – 7 = 8
Explanation:
Given Subtraction sentence. We subtract the subtrahend from the minuend to get the difference.
15 – 7 = 8
15 is minuend and 7 is subtrahend and 8 is difference

Question 3.

Answer:
9 – 6 = 3
Explanation:
Given Subtraction sentence. We subtract the subtrahend from the minuend to get the difference.
9 – 6 = 3
9 is minuend and 6 is subtrahend and 3 is difference.

Question 4.

Answer:
3 + 1 = 4
Explanation:
Given addition sentence 3 and 1 are addends. when we add both the addend we get the sum
3 + 1 = 4
4 is the sum

Question 5.

Answer:
10 + 6 = 16
Explanation:
Given addition sentence 10 and 6 are addends. when we add both the addend we get the sum
10 + 6 = 16
16 is the sum

Question 6.

Answer:
11 – 2 = 9
Explanation:
Given Subtraction sentence. We subtract the subtrahend from the minuend to get the difference.
11 – 2 = 9
11 is minuend and 2 is subtrahend and 9 is difference .

Use . Draw to show tens. Write the sum. Write how many tens.
Question 7.
30 + 50 = _____
_____ tens
Answer:
30 + 50 = 80

Explanation:
ONE line represents tens
1 line = 10
30 + 50 = 80
80 = 8 lines

Chapter 8 Review/Test Answer Key 1st Grade Question 8.
40 + 20 = _____
______ tens
Answer:
40 +20 = 60

Explanation:
ONE line represents tens
1 line = 10
40 + 20 = 60
60 = 6 lines

Use . Draw to show tens. Write the difference. Write how many tens.
Question 9.
90 – 20 = _____
_____ tens
Answer:
90 – 20 = 70

Explanation:
We subtract the subtrahend from the minuend to get the difference.
90 – 20 = 70
90 is minuend and 20 is subtrahend and 70 is difference of both
ONE line represents tens
1 line = 10
90 – 20 = 70
70 = 7 lines

Question 10.
60 – 40 = _____
____ tens
Answer:
60 – 40 = 20

Explanation:
We subtract the subtrahend from the minuend to get the difference.
60 – 40 = 20
60 is minuend and 40 is subtrahend and 20 is difference of both
ONE line represents tens
1 line = 10
60 – 40 = 20
20 = 2 lines

Question 11.
THINK SMARTER
Mike has 60 marbles. He gives 20 to Kathy. How many marbles does Mike have left? Show your work.
_______ marbles
Answer:
Total number of marbles with Mike = 60
Number of marbles Mike gave to Kathy = 20
Number of marbles left with Mike = Total marbles – number of marbles he gave to Kathy
60 – 20 = 40

Lesson 8.4 Use a Hundred Chart to Add

Essential Question How can you use a hundred chart to count on by ones or tens?

Listen and Draw
Use the hundred chart to solve the problems.

MATHEMATICAL PRACTICES
Explain how you can use a hundred chart to find each sum.
Answer:

Share and Show

Use the hundred chart to add. Count on by ones or tens.
Question 1.
42 + 7 = _____
Answer:
42 + 7 = 49

Explanation:
From 42 we need to count 7 to reach 49.
To reach 49 we need to count 7 ones from 42.

Go Math Grade 1 Lesson 8.4 Answer Key Question 2.
57 + 30 = _____
Answer:
57 + 30 = 87

Explanation:
To count 30 from 57
we need to count 3 ones from 57 to 60
2 tens count from 60 to 80
From 81 need to count 7 ones to 87.
10 ones count and 2 tens count.

Question 3.
91 + 5 = _____
Answer:
91 + 5 = 96

Explanation:
91 + 5 = 96
There is a 5 ones count from 91 to 96.

Question 4.
18 + 50 = _____
Answer:
18 + 50 = 68

Explanation:
From 18 we need to count 50
18 + 50 = 68
To reach 68 from 18
we need 10 ones count and 4 tens count.
18 to 20 – 2 ones counts and 61 to 68 – 8 ones counts.
20 to 60 we need 4 tens count.

On Your Own

MATHEMATICAL PRACTICE Use Appropriate Tools Use the hundred chart to add. Count on by ones or tens.
Question 5.
13 + 70 = ____
Answer:
13 + 70 = 83

Explanation:
From 13 we need to count 70
13 + 70 = 83
To reach 83 from 13
we need 10 ones count and 6 tens count.
13 to 20 – 7 one’s counts and 20 to 80 – 6 tens counts.
80 to 83 we need 3 ones count.

Go Math Grade 1 Chapter 8 Answer Key Question 6.
22 + 6 = ____
Answer:
22 + 6 = 28

Explanation:
From 22 we need to count 6
22 + 6 = 28
To reach 28 from 22
we need 6 ones count.

Question 7.
71 + 3 = ____
Answer:
71 + 3 = 74

Explanation:
From 71 we need to count 3
71 + 3 = 74
To reach 74 from 71
we need 3 ones count.
71 – 74 we need 3 ones count.

Question 8.
49 + 50 = ____
Answer:
49 + 50 = 99

Explanation:
From 49 we need to count 50
49 + 50 = 99
To reach 99 from 49
we need 10 ones count and 4 tens count.
49 to 50 – 1 ones counts and 50 to 90 – 4 Tens counts.
90 – 99 we need 9 ones count.

Question 9.
53 + 4 = ____
Answer:
53 + 4 = 57

Explanation:
From 53 we need to count 4
53 + 4 = 57
To reach 57 from 53
we need 4 ones count.
53 – 57 we need 4 ones count.

Question 10.
25 + 40 = ____
Answer:
25 + 40 = 65

Explanation:
From 25 we need to count 40
25 + 40 = 65
To reach 65 from 25
we need 10 ones count and 3 tens count.
 25 to 30 – 5 ones counts and 30 to 60 – 3 tens counts.
60 to 65 we need 5 ones count.

Question 11.
GO DEEPER
Solve. Show your work.
31 + 20 + 40 = ____
Answer:
31 + 20 + 40 = 91

Explanation:
From 31 we need to count 20 first
31 + 20 = 51
To reach 51 from 31
we need 10 ones count and 1 tens count.
31 to 40 – 9 ones counts and 40- 50 1 tens counts.
50 – 51 we need 1 ones count.
From 51 we need to count 40 more
51 + 40 = 91
To reach 91 from 51
we need 10 ones count and 3 tens count.
51 to 60 – 9 ones counts and 60- 90 3 tens counts.
90 – 91 we need 1 ones count.

Problem Solving • Applications

Choose a way to solve. Draw or write to show your work.
Question 12.
THINK SMARTER
Rae put 20 books away. She put 20 more books away, then 11 more. How many books did Rae put away?

______ books
Answer:
Number of books Rae puts away at first = 20
Number of books Rae puts away at second =20
Number of books Rae puts away at Last = 11
Total number of books Rae puts away = 20 + 20 + 11 = 51 books

Explanation:
From 1 we need to count 20 first
0 + 20 = 20
To reach 20 from 1
we need 10 ones count and 1 tens count.
1 to 10 – 9 ones counts and 10- 20 1 tens counts.
From 20 another 20 count is added
From 20 we need to count 20 more
20 + 20 = 40
To reach 40 from 20
we need 10 ones count and 1 tens count.
20 to 30 – 10 ones counts and 30- 40 1 tens counts.
From 40 count another 11
40 +11 = 51
To reach 51 from 40 we need 11 one counts.

Go Math Grade 1 Chapter 8 Pdf Lesson 7 Question 13.
THINK SMARTER+
Use the hundred chart to add. Count on by ones or tens.

62 + 9 = _____
Explain how you used the chart to find the sum.
Answer:
62 + 9 = 71

TAKE HOME ACTIVITY • On a piece of paper, write 36 + 40. Ask your child to explain how to use the hundred chart to count on by tens to find the sum.

Use a Hundred Chart to Add Homework & Practice 8.4

Use the hundred chart to add. Count on by ones or tens.

Question 1.
47 + 2 = ____
Answer:

Explanation:
from 47 count 2
47 + 2 = 49
to reach 49 from 47 count 2 ones.

Question 2.
26 + 50 = ____
Answer:
26+50=76

Explanation:
From 26 we need to count 50
26 + 50 = 76
To reach 76 from 26
we need 10 ones count and 4 tens count.
 26 to 30 – 4 ones counts and 30 to 70 – 4 tens counts.
70 to 76 we need 6 ones count.

Question 3.
22 + 5 = ____
Answer:
22 + 5 = 27

Question 4.
4 + 85 = ____
Answer:

Problem Solving
Choose a way to solve. Draw or write to show your work.
Question 5.
17 children are on the bus. Then 20 more children get on the bus. How many children are on the bus now?
______ children
Answer:
Number of students in the bus at first = 17
Later few more got into the bus
Number of students who got into the bus later = 20
Total number of students in the bus =
17 + 20 = 37
Total 37 students in the bus.

Question 6.
WRITE
Write a number sentence to add 6 ones to 21. Write a number sentence to add 6 tens to 21.
Answer:
Number sentence to add 6 ones to 21
21 + 6 =27
Number sentence to add 6 tens to 21
21 + 60 = 81

Lesson Check

Question 1.
What is the sum? Write the number.
42 + 50 = _____
Answer:
42 + 50 = 92

Question 2.
What is the sum? Write the number.
11 + 8 = _____
Answer:
11 + 8 = 19

Spiral Review
Question 3.
Use mental math. What number is ten less than 52? Write the number.
______
Answer:
Number Ten less than 52 = 52 – 10 = 42
42 is the number.

Question 4.
Write an addition fact that helps you solve 16 − 9.
____ + ____ = _____
Answer:
16 – 9 = 7
7 + 9 = 16.

Lesson 8.5 Use Models to Add

Essential Question How can models help you add ones or tens to a two-digit number?

Listen and Draw
Draw to show how you can find the sum.
14 + 5 = _____
Answer:

Explanation:
14 = 1 tens and 4 once
5 = 5 ones
when adding 14 + 5 = 19
we add the ones and keep the tens constant as their is no tens place in the second addend
1 tens + (4 + 5)ones =  1 tens + 9 ones
19

MATHEMATICAL PRACTICES
Model Explain how you found the sum.
Answer:

Share and Show

Use . Draw to show how to add the ones. Write the sum.
Question 1.
27 + 2 = _____
Answer:

Explanation:
27 = 2 tens and 4 ones
2 = 2 ones
when adding 27 + 2
we add the ones and keep the tens constant as their is no tens place in the second addend
2 tens + (7 + 2)ones =  2 tens + 9 ones
27 + 2 = 29

Question 2.
41 + 5 = ____
Answer:

Explanation:
41 = 4 tens and 1 ones
5 = 5 ones
when adding 41 + 5
we add the ones and keep the tens constant as their is no tens place in the second addend
4 tens + (1 + 5)ones =  4 tens + 6 ones
41 + 5 = 46

Use . Draw to show how to add the tens. Write the sum.
Question 3.
13 + 50 = _____
Answer:

Explanation:
13 = 1 tens and 3 ones
50 = 5 tens
when adding 13 + 50
we add the tens and keep the ones constant as their is no ones place in the second addend
(1 tens + 3 ones) + 5 tens =  (1 + 5) tens + 3 ones
6 tens + 3 ones
13 + 50 = 63.

Question 4.
28 + 30 = _____
Answer:

Explanation:
28 = 2 tens and 8 ones
30 = 3 tens
when adding 28 + 30
we add the tens and keep the ones constant as their is no ones place in the second addend
(2 tens + 8 ones) + 3 tens =  (2 + 3) tens + 8 ones
5 tens + 8 ones
28 + 30 = 58.

On Your Own

MATHEMATICAL PRACTICE Use Models
Use and your MathBoard. Add the ones or tens. Write the sum.
Question 5.
65 + 3 = ____
Answer:

Explanation:
65 = 6 tens and 5 ones
3 = 3 ones
when adding 65 + 3
we add the ones and keep the tens constant as their is no tens place in the second addend
(6 tens +5 ones) + 3 ones =  6 tens +(5 + 3) ones
6 tens + 8 ones
65 + 3 = 68.

Question 6.
81 + 8 = _____
Answer:

Explanation:
81 = 8 tens and 1 ones
8 = 8 ones
when adding 81 + 8
we add the ones and keep the tens constant as their is no tens place in the second addend
(8 tens + 1 ones) + 8 ones =  8 tens +(8+1)ones
8 tens + 9 ones
81 + 8 = 89

Question 7.
54 + 20 = ____
Answer:

Explanation:
54 = 5 tens and 4 ones
20 = 2 tens
when adding 54 + 20
we add the tens and keep the ones constant as their is no ones place in the second addend
(5 tens + 4 ones) + 2 tens =  (5 + 2) tens + 4 ones
7 tens + 4 ones
54 + 20 = 74

Question 8.
32 + 10 = ____
Answer:

Explanation:
32 = 3 tens and 2 ones
10 = 1 tens
when adding 32 + 10
we add the tens and keep the ones constant as their is no ones place in the second addend
(3 tens + 2 ones) + 1 tens =  (3 + 1) tens + 2 ones
4 tens + 2 ones
32 + 10 = 42.

Question 9.
95 + 2 = ____
Answer:

Explanation:
95 = 9 tens and 5 ones
2 = 2 ones
when adding 95 + 2
we add the ones and keep the tens constant as their is no tens place in the second addend
(9 tens + 5 ones) + 2 ones =  9 tens +(5+2)ones
9 tens + 7 ones
95 + 2 = 97

Question 10.
25 + 60 = ____
Answer:

Explanation:
25 = 2 tens and 5 ones
60 = 6 tens
when adding 25 + 60
we add the tens and keep the ones constant as their is no ones place in the second addend
(2 tens + 5 ones) + 6 tens =  (2 + 6) tens + 5 ones
8 tens + 5 ones
25 + 60 = 85.

Question 11.
2 + 54 = _____
Answer:

Explanation:
54 = 5 tens and 4 ones
2 = 2 ones
when adding 2 + 54
we add the ones and keep the tens constant as their is no tens place in the first addend
2 ones + 5 tens + 4 ones  =  5 tens +(2+4)ones
5 tens + 6 ones
2 +54 = 56

Question 12.
70 + 29 = ____
Answer:

Explanation:
29 =  2 tens and 9 ones
70 = 7 tens
when adding 70 + 29
we add the tens and keep the ones constant as their is no ones place in the second addend
7 tens + 2 tens 9 ones  =  (7+ 2) tens + 9 ones
9 tens + 9 ones
70 + 29 = 99

GO DEEPER Make a sum of 45. Draw a quick picture. Write the number sentence.
Question 13.
Add ones to a two-digit number.
_____ + _____ = 45
Answer:
5 + 40 = 45

Question 14.
Add tens to a two-digit number.
_____ + _____ = 45
Answer:
20 + 25 = 45

Problem Solving • Applications

Choose a way to solve. Draw or write to show your work.
Question 15.
Rita picks 63 strawberries. Then she picks 30 more. How many strawberries does Rita pick?

_____ strawberries
Answer:
Number of strawberries Rita picked at first = 63
Number of more strawberries Rita picked = 30
Total number of strawberries Rita picked = 63 + 30 = 93.

Question 16.
THINK SMARTER
Kenny planted two rows of corn. He used 20 seeds in each row. He has 18 seeds left. How many seeds of corn did Kenny have?

_____ seeds
Answer:
Number of seeds in a row = 20
Number of rows = 2
Total number of seeds planted in 2 rows = 2 × 20 = 40
Number of seed left = 18
Total number of seeds = 40 + 18 = 58

Question 17.
There are 7 oak trees and 32 pine trees in the park. How many trees are in the park?

_____ trees

Number of oak trees = 7
Number of pine trees = 32
Total number of trees in park =7 + 32 = 39

Answer:

Question 18.
THINK SMARTER
Use the model. Draw to show how to add the tens.

Answer:

TAKE HOME ACTIVITY • Give your child the addition problems 25 + 3 and 25 + 30. Ask your child to explain how to solve each problem.

Use Models to Add Homework & Practice 8.5

Use and your MathBoard. Add the ones or tens. Write the sum.
Question 1.
44 + 5 = _____
Answer:

Explanation:
44 = 4 tens and 4 ones
5 = 5 ones
when adding   44 + 5
we add the ones and keep the tens constant as their is no tens place in the first addend
4 tens + 4 ones +5 ones  =  4 tens +(4+5)ones
4 tens + 9 ones = 49
44 + 5 = 49

Question 2.
16 + 70 = _____
Answer:

Question 3.
78 + 20 = _____
Answer:

Question 4.
52 + 7 = _____
Answer:

Explanation:
52 = 5 tens and 2 ones
7 = 7 ones
when adding  52 + 7
we add the ones and keep the tens constant as their is no tens place in the first addend
5 tens + 2 ones +7 ones  =  5 tens +(2+7)ones
5 tens + 9 ones = 59
52+ 7 = 59.

Question 5.
2 + 13 = _____
Answer:

Explanation:
2 = 2 ones
13 = 1 tens and 3 ones
when adding   2 +13
we add the ones and keep the tens constant as their is no tens place in the first addend
2 ones + 1 tens + 3 ones +  =  1 tens +(2+3)ones
1 tens + 5 ones = 15
2 + 13 = 15

Question 6.
73 + 4 = ____
Answer:

Explanation:
73 = 7 tens and 3 ones
4 = 4 ones
when adding  73 + 4
we add the ones and keep the tens constant as their is no tens place in the first addend
7 tens + 3 ones + 4 ones  =  7 tens +(3+4)ones
7 tens + 7 ones = 77
73 + 4 = 77

Question 7.
65 + 3 = ____
Answer:

Explanation:
65 = 6 tens and 5 ones
3 = 3 ones
when adding  65 + 3
we add the ones and keep the tens constant as there is no tens place in the first addend
6 tens + 5 ones +3 ones  =  6 tens +(5+3)ones
6 tens + 8 ones = 68
65 +3 =68..

Go Math 1st Grade Chapter 8 Answer Key Question 8.
20 + 25 = ____
Answer:

Explanation:
25 =  2 tens and 5 ones
20 = 2 tens
when adding 20 + 25
we add the tens and keep the ones constant as their is no ones place in the second addend
(2 tens ) + (2 tens+ 5 ones)  =  (2+ 2) tens + 5 ones
4 tens + 5 ones = 45
20 + 25 = 45

Question 9.
49 + 30 = _____
Answer:

Explanation:
49 =  4 tens and 9 ones
30 = 3 tens
when adding 49 + 30
we add the tens and keep the ones constant as their is no ones place in the second addend
(4 tens + 9 ones) + 3 tens  =  (4+ 3) tens + 9 ones
7 tens + 9 ones = 79
49 + 30 =79

Question 10.
81 + 8 = _____
Answer:

Explanation:
81 = 8 tens and 1 ones
8 = 8 ones
when adding 81 + 8
we add the ones and keep the tens constant as their is no tens place in the second addend
(8 tens + 1 ones) + 8 ones =  8 tens +(8+1)ones
8 tens + 9 ones
81 + 8 = 89.

Problem Solving

Solve. Draw or write to explain.
Question 11.
Maria has 21 marbles. She buys a bag of 20 marbles. How many marbles does Maria have now?
______ marbles
Answer:
Number of marbles Maria had = 21
Number of marbles Maria bought = 20
Total number of marbles Maria have now = 21 + 20 = 41.

Question 12.
WRITE
Write a story problem about 40 apples and 17 pears.
Answer:

Lesson Check
Question 1.
What is the sum? Write the number.
62 + 30 = _____
Answer:
62 + 30 = 92

Explanation:
62 =  6 tens and 2 ones
30 = 3 tens
when adding 62 + 30
we add the tens and keep the ones constant as their is no ones place in the second addend
6 tens + 2 ones + 3 tens  =  (6 + 3) tens + 2 ones
9 tens + 2 ones = 92

Question 2.
What is the sum? Write the number.
37 + 2 = _____
Answer:
37 + 2 = 39

Explanation:
37 = 3 tens and 7 ones
2 = 2 ones
when adding 37 + 2
we add the ones and keep the tens constant as their is no tens place in the first addend
3 tens + 7 ones + 2 ones =  3 tens +(7 + 2)ones
3 tens + 9 ones = 39
37 + 2 = 39

Spiral Review
Question 3.
Write two ways to make 15.
____ + ____ = 15
_____ + ____ = 15
Answer:
10 + 5 = 15
3 + 12 = 15

Question 4.
What number does the model show?

______
Answer:
The number represented in the model is 103
10 tens and 3 ones = 103
Explanation
In the model show
lines represents tens
dot represents ones
There are 10 line and 3 dots
100 + 3 = 103.

Lesson 8.6 Make Ten to Add

Essential Question How can making a ten help you add a two-digit number and a one-digit number?

Listen and Draw

Use . Draw to show how you can find the sum.
21 + 6 = _____
Answer:
21 + 6 = 27

MATHEMATICAL PRACTICES
Use Tools Explain how your model shows the sum of 21 + 6.
Answer:
21 + 6 = 27

Share and Show

Use . Draw to show how you make a ten. Find the sum.
Question 1.
49 + 3 = ?
_____ + ____ = _____
So, 49 + 3 = ____
Answer:
49 + 3 =
50 + 2 = 52
49 + 3 = 52

Explanation:
49  + 3 = 52
while adding the ones 9 + 3 we are borrowing 1 ones from 3 to make it tens.
Remaining 2 ones are added to the tens.
49 + 1 + 2 = 50 + 2 = 52.

On Your Own

MATHEMATICAL PRACTICE Use a Concrete Model
Use . Draw to show how you make a ten. Find the sum.
Question 2.
39 + 7 = _____
Answer:

Explanation:
39  + 7 = 46
while adding the ones 9 + 7 we are borrowing 1 ones from 7 to make it tens.
Remaining 6 ones are added to the tens.
39 + 1 + 6
= 40 + 6
= 46.

Question 3.
72 + 9 = _____
Answer:

Explanation:
72 + 9
while adding the ones 2 + 9 we are borrowing 8 ones from 9 ones to make it tens.
Remaining 1 ones are added to the tens.
72 + 9
=72 + 8 + 1
= 80 + 1
= 81.

Question 4.
58 + 5 = ____
Answer:

Explanation:
58 + 5 = 63
while adding the ones 8 + 5 we are borrowing 2 ones from 5 to make it tens.
Remaining 3 ones are added to the tens.
58 + 5
=58 + 2 +3
= 60 + 3
= 63

THINK SMARTER Solve. Write the numbers.
Question 5.

So, 46 + 7 = _____
Answer:
46 + 7 = 53

Question 6.

So, 53 + 8 = _____
Answer:
53 + 8 = 53 + 7 + 1 = 60 +1 = 61

Problem Solving • Applications

Choose a way to solve. Draw or write to show your work.
Question 7.
THINK SMARTER
Koby puts 24 daisies and 8 tulips in a vase. How many flowers are in the vase?

______ flowers
Answer:
Number of Daisies flower = 24
Number of Tulips flowers = 8
Total number of flowers = 24 + 8
24 + 6 + 2
30 + 2
32.

Question 8.
GO DEEPER
There are 27 ducklings in the water. 20 of them come out of the water. How many ducklings are still in the water?

______ ducklings
Answer:
Total Number of Ducklings in the water = 27
Number of ducklings came out of water = 20
Number of ducklings still in water = 27 – 20 = 7
7 ducklings are still in the water.

Question 9.
Write the missing addend.

Answer:
46 + 6 = 52
Explanation:
To find the missing addend
we need to subtract the 1st addend from the sum
52 – 46 =6.
6 is the missing addend.

Question 10.
THINK SMARTER
Use the model. Draw to show how to make a ten.

Answer:

Explanation:
58 + 5 = 63
while adding the ones 8 + 5 we are borrowing 2 ones from 5 to make it tens.
Remaining 3 ones are added to the tens.
58 + 5
=58 + 2 +3
= 60 + 3
= 63

TAKE HOME ACTIVITY • Ask your child to explain how to find the sum for 25 + 9.

Make Ten to Add Homework & Practice 8.6

Use . Draw to show how you make a ten. Find the sum.
Question 1.
26 + 5 = ______
Answer:

Explanation:
26 + 5
while adding the ones 6 + 5 we are borrowing 4 ones from 5 to make it tens.
Remaining 1 ones are added to the tens.
26 + 5
26 + 4 + 1
30 + 1
31

Question 2.
68 + 4 = _____
Answer:

Explanation:
68 + 4 = 72
while adding the ones 8 + 4 we are borrowing 2 ones from 4 to make it tens.
Remaining 2 ones are added to the tens.
68 + 4
68 + 2 + 2
70 + 2
72

Problem Solving

Choose a way to solve. Draw or write to show your work.
Question 3.
Debbie has 27 markers. Sal has 9 markers. How many markers do they have?
_______ markers
Answer:
Number of markers with Debbie = 27
Number of markers with Sal = 9
Total number of markers both have = 27 + 9 = 36.
36 markers.

Question 4.
WRITE
Use words or pictures to explain how to solve 44 + 7.
Answer:

Explanation:
44 + 7
while adding the ones 4 + 7 we are borrowing 6 ones from 7 ones to make it tens.
Remaining 1 ones are added to the tens.
44 + 7
44 + 6 + 1
50  +  1
51

Lesson Check
Question 1.
What is the sum? Write the number.
47 + 6 = _____
Answer:

Explanation:
47 + 6
while adding the ones 7 + 6 we are borrowing 3 ones from 6 ones to make it tens.
Remaining 3 ones are added to the tens.
47 + 6
47 + 3 + 3
50 + 3
53

Question 2.
What is the sum? Write the number.
84 + 8 = _____
Answer:

Explanation:
84 + 8
while adding the ones 4 + 8 we are borrowing 6 ones from 8 ones to make it tens.
Remaining 2 ones are added to the tens.
84 + 8
=84 + 6 + 2
= 90 + 2
= 92

Spiral Review
Question 3.
What number does the model show? Write the number.

Answer:
11 tens + 4 ones
110 + 4
114

Question 4.
Write a number to make the sentence true.
5 + 4 = 10 – ______
Answer:
5 + 4 = 10 – 1

Lesson 8.7 Use Place Value to Add

Essential Question How can you model tens and ones to help you add two-digit numbers?

Listen and Draw

Model the problem with . Draw a quick picture to show your work.

MATHEMATICAL PRACTICES
Describe How many tens? How many ones? How many in all?
Answer:

Share and Show

Draw a quick picture. Use tens and ones to add.
Question 1.

Answer:

On Your Own

MATHEMATICAL PRACTICE Make Connections Draw a quick picture. Use tens and ones to add.
Question 2.

Answer:

Question 3.

Answer:

Question 4.
THINK SMARTER
Solve.

Answer:

Question 5.

Answer:

1st Grade Go Math Lesson 8.7 Answer Key Question 6.
THINK SMARTER
Draw a quick picture to solve. Han has 37 shells. Jonah had 15 shells. How many shells do they have?

_______
Answer:
Number of shells Han has = 37
Number of shells Jonah has =15
Total number of shells both has = 37 + 15 = 52

Problem Solving • Applications

Question 7.
THINK SMARTER
Draw a quick picture to solve. Kim has 24 marbles. Al has 47 marbles.How many marbles do they have?

______ marbles
Answer:
Number of marbles Kim has = 24
Number of marbles Al has =47
Total number of marbles both have = 24 + 47 = 71

Question 8.
GO DEEPER
Choose two addends from 11 to 49. Draw them. Add in any order to solve.

Answer:
35 and 45 are the two addends

Question 9.
THINK SMARTER
Write the addition that the model shows. Solve.

Answer:

Explanation:
There are 5 tens and 2 ones in the first addend and 1 tens and 5 ones in the second addend
(5 + 1) tens + (2 + 5 )ones = 6 tens + 7 ones = 60 + 7 = 67.

TAKE HOME ACTIVITY • Write the numbers 42 and 17. Have your child tell how to find the sum by adding the tens and ones.

Use Place Value to Add Homework & Practice 8.7

Draw a quick picture. Use tens and ones to add.
Question 1.

Answer:

Question 2.

Answer:

Problem Solving
Question 3.
Write two addition sentences you can use to find the sum. Then solve.

Answer:

Question 4.
WRITE
Write and solve a story problem to add 12 and 18.
Answer:
Ram has 12 five star chocolates. Ravi has 18 much chocolates. How many chocolates does they have..?
Answer:
Number of chocolates Ram have = 12
Number of chocolates Ravi have =18
Total number of chocolates does both have = 12 + 18 = 30.

Lesson Check
Question 1.
What is the sum? Write the number.

Answer:

Question 2.
What is the sum? Write the number.

Answer:

Spiral Review
Question 3.
I have 28 cubes. How many tens and ones can I make?
_____ tens ____ ones
_____ ten _____ ones
Answer:
You can make as below
2 tens 8 ones
1 ten 18 ones

Question 4.
What is the sum? Write the number.

Answer:

Lesson 8.8 Problem Solving • Addition Word Problems

Essential Question How can drawing a picture help you explain how to solve an addition problem?

Kelly gets 6 new toy cars. He already has 18 toy cars. How many does he have now?

Show how to solve the problem.

____________________
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_____________________
Answer:
Number of toy cars Kelly got = 6
Number of toy cars Kelly had = 18
Total number of toy cars with Kelly = 18 + 6 = 24.

HOME CONNECTION • Being able to show and explain how to solve a problem helps your child build on their understanding of addition.

Try Another Problem

Draw and write to solve. Explain your reasoning.
Question 1.
Aisha picks 60 blueberries to make a pie. Then she picks 12 more to eat. How many blueberries does Aisha pick?

Answer:
Number of blueberries Aisha picked to make a pie = 60
Number of blueberries Aisha picked to eat = 12
Total number of blueberries Aisha picked = 60 +12 = 72.

Question 2.
Yuri collects 21 cans for the school food drive. Leo collects 36 cans. How many cans do Yuri and Leo collect?

Answer:
Number of cans Yuri collects from school food drive =21
Number of cans Leo collects  = 36
Total number of cans Yuri and Leo collects = 21 + 36 =57.

MATHEMATICAL PRACTICES
Explain the addition strategy you used to solve Exercise 1.
Answer:

Share and Show

MATHEMATICAL PRACTICE Use Reasoning Draw and write to solve.
Question 3.
Tyra sees 48 geese in the field. Then she sees 17 more geese in the sky. How many geese does Tyra see?

______ geese
Answer:
Number of geese Tyra sees in the field = 48
Number of geese Tyra sees in the sky = 17
Total number of geese Tyra sees = 48 + 17 =  65.

Question 4.
Jade paints 35 circles and 45 triangles in art class. How many shapes does Jade paint?

_____ shapes
Answer:
Number of circles Jade paints = 35
Number of triangles Jade paints = 45
Total number of shapes Jade paints = 35 +45 =80

Question 5.
THINK SMARTER
It takes 10 hops to get across the yard. How many hops does it take to get across the yard and back?

_____ hops
Answer:
Number of hops to get across the yard = 10
Number of hops to get across the yard and back the yard = 2 times the hops to gt across the yard
10 + 10 = 20.

On Your Own

Choose a way to solve. Draw or write to explain.
Question 6.
THINK SMARTER
Julian sells 3 books of tickets for the school fair. Each book has 20 tickets. How many tickets does Julian sell?

_____ tickets
Answer:
Number of tickets in each book = 20 tickets
Number of books of tickets Julian sell = 3
Total number of tickets Julian sell = 3 × 20
60 tickets.

Question 7.
GO DEEPER
I have some red roses and pink roses. I have 14 red roses. I have 8 more pink roses than red roses. How many roses do I have?

______ roses
Answer:
Total number of red roses i have = 14
Number of pink roses are 8 more than red roses = 8 +14 = 22
Total number of roses i have = 14 + 22 = 36.
I have 36 roses.

Question 8.
THINK SMARTER+
Ella sees 27 . She sees 28 . How many does Ella see? Circle the number that makes this sentence true.

Answer:
Number of Ella sees = 27
Number of Ella sees = 28
Total number of  Ella sees = 27 + 28 = 55

TAKE HOME ACTIVITY • Ask your child to solve 16 + 7, 30 + 68, and 53 + 24. Ask him or her to explain how they solved each problem.

Problem Solving • Addition Word Problems Homework & Practice 8.8

Draw and write to solve. Explain your reasoning.
Question 1.
Jean has 10 fish. She gets 4 more fish. How many fish does she have now?
____________________________
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_____________________________
_____ fish
Answer:
Number of fish Jean has = 10
Number of more fish she gets = 4
Total number of fish she have = 10 + 4 = 14

Explanation:
Given
Jean has 10 fish = 10
She gets more fish = 4
now on adding the both we get the total fish she have = 10 + 4 = 14.

Question 2.
Courtney buys 2 bags of apples. Each bag has 20 apples. How many apples does she buy?
____________________________
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_____________________________
_____ apples
Answer:
Number of bags of apples Courtney buys = 2
Number of apples in each bag = 20
Total number of apples she buy = 2 × 20 = 40
20 + 20 = 40 apples.

Question 3.
John bakes 18 blueberry muffins and 12 banana muffins for the bake sale. How many muffins does he bake?
_____________________________
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_____________________________
______ muffins
Answer:
Number of blueberry muffins John bakes = 18
Number of banana muffins John bakes = 12
Total number of muffins John bakes = 18 + 12 = 30 muffins.

Question 4.
WRITE
Draw a picture to show how to find 12 + 37.
Answer:

Lesson Check
Question 1.
Amy has 9 books about dogs. She has 13 books about cats. How many books does she have about dogs and cats? Solve. Show your work. Write the number.
______ books
Answer:
Number of books about dogs Amy has = 9
Number of books about cats Amy has = 13
Total number of books about dogs and cats Amy has = 9 + 13 = 21 books.

Spiral Review
Question 2.
What is the sum for 4 + 2 + 4? Write the number.
______
Answer:
4 + 2 + 4 = 10

Question 3.
Solve. Use the ten frame to make a ten to help you subtract. Ray has 14 pens. 8 are black. The rest are blue. How many pens are blue?
______ blue pens

Answer:
Total number of pens = 14
Number of black pens = 8
Number of blue tens = total – black pens
14 – 8 = 6
8 + 6 = 14.

Lesson 8.9 Related Addition and Subtraction

Essential Question How can you use a hundred chart to show the relationship between addition and subtraction?

Listen and Draw

Use the hundred chart to solve the problems.

MATHEMATICAL PRACTICES
Apply Describe how you can use a hundred chart to find the sum and the difference.
Answer:

Share and Show

Use the hundred chart to add and subtract. Count up and back by tens.
Question 1.
56 + 20 = _____
76 – 20 = ______
Answer:

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 56 + 20 = 76
it is represented with blue color. its a down flow. So, from 56 we count 2 tens down.
Second sentence = 76 – 20 = 56
it is represented with orange color. its a up flow. So, from 76 we count 2 tens up.

Question 2.
48 + 50 = _____
98 – 50 = _____
Answer:

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 48 + 50 = 98
it is represented with blue color. its a down flow. So, from 48 we count 5 tens down.
Second sentence = 98 – 50 = 48
it is represented with orange color. its a up flow. So, from 98 we count 5 tens up.

On Your Own

Answer:

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 28 + 60 = 88
it is represented with blue color. its a down flow. So, from 28 we count 6 tens down.
Second sentence = 88 – 60 = 28
it is represented with orange color. its a up flow. So, from 88 we count 6 tens up.

MATHEMATICAL PRACTICE Look for a Pattern Use the hundred chart to add and subtract. Count up and back by tens.
Question 3.
36 + 30 = _____
66 – 30 = ______
Answer:

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 36 + 30 = 66
it is represented with blue color. its a down flow. So, from 36 we count 3 tens down.
Second sentence = 66 – 30 = 36
it is represented with orange color. its a up flow. So, from 66 we count 3 tens up.

Question 4.
73 + 10 = _____
83 – 10 = ______
Answer:

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 73 + 10 = 83
it is represented with blue color. its a down flow. So, from 73 we count 1 tens down.
Second sentence = 83 – 10 = 73
it is represented with orange color. its a up flow. So, from 83 we count 1 tens up.

Question 5.
25 + 70 = _______
95 – 70 = ______
Answer:

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 25 + 70 = 95
it is represented with blue color. its a down flow. So, from 25 we count 7 tens down.
Second sentence = 95 – 70 = 25
it is represented with orange color. its a up flow. So, from 95 we count 7 tens up.

Question 6.
18 + 40 = ______
58 – 40 = ______
Answer:

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 18 + 40 = 58
it is represented with blue color. its a down flow. So, from 18 we count 4 tens down.
Second sentence = 58 – 40 = 18
it is represented with orange color. its a up flow. So, from 58 we count 4 tens up.

Question 7.
THINK SMARTER
Solve. There are 73 bees in a hive. 10 bees fly away. Then 10 more bees fly into the hive. How many bees are in the hive now?

______ bees
Answer:
Total number of bees in hive = 73
Number of bees flew away = 10
Number of bees flew back into the hive = 10
Total number of bees in the hive = 73 – 10 = 63 + 10 = 73.

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 73 +10 = 83
it is represented with blue color. its a down flow. So, from 73 we count 1 tens down.
Second sentence = 83 – 10 = 73
it is represented with orange color. its a up flow. So, from 83 we count 1 tens up.

Problem Solving • Applications

Solve. Draw or write to show your work.
Question 8.
THINK SMARTER
There are 38 ants on a rock. 10 move to the grass. 10 walk up a tree. How many ants are on the rock now?

______ ants
Answer:
Total  number of ants on the rock = 38
Number of ants move to grass = 10
Number of ants walk up the tree = 10
Number of ants on the rock = 38 – 10 – 10 = 18 ants.

Question 9.
GO DEEPER
There are 27 birds at the park. 50 more birds come. Then 50 fly away. How many birds are at the park now?

_______ birds
Answer:
Number of birds in the park = 27
Number of birds came into the park = 50
Number of birds flew away =50
Total number of birds in the park = 27 + 50 = 77 – 50 = 27.

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 27+ 50 = 77
it is represented with blue color. its a down flow. So, from 27 we count 5 tens down.
Second sentence = 77 – 50 = 27
it is represented with orange color. its a up flow. So, from 77 we count 5 tens up.

Question 10.
THINK SMARTER
Match the math sentences that count up and back by tens.

Answer:

TAKE HOME ACTIVITY • On slips of paper, write 36 + 40 and 76 − 40. Ask your child to explain how to use the hundred chart to count up and back by tens to find the sum and the difference.

Related Addition and Subtraction Homework & Practice 8.9

Use the hundred chart to add and subtract. Count up and back by tens.

Question 1.
16 + 60 = _____
76 – 60 = ______
Answer:

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 16 + 60
it is represented with blue color. its a down flow. So, from 16 we count 6 tens down.
Second sentence = 76 – 60
it is represented with orange color. its a up flow. So, from 76 we count 6 tens up.

Question 2.
61 + 30 = ______
91 – 30 = ______
Answer:

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 61 + 30
it is represented with blue color. its a down flow. So, from 61 we count 3 tens down.
Second sentence =91 – 30
it is represented with orange color. its a up flow. So, from 91 we count 3 tens up.

Question 3.
64 + 20 = _____
84 – 20 = ______
Answer:

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 64 + 20
it is represented with blue color. its a down flow. So, from 64 we count 2 tens down.
Second sentence = 84 – 20
it is represented with orange color. its a up flow. So, from 84 we count 2 tens up.

Problem Solving

Choose a way to solve. Draw or write to show your work.
Question 4.
There are 53 leaves in a tree. 20 leaves blow away. How many leaves are left in the tree?
______ leaves
Answer:
Total number of leaves on the tree = 53 leaves
Number of leaves blow away = 20
Number of leaves left on the tree = 53 – 20 = 33
33 leaves.

Question 5.
WRITE
Write a number sentence to subtract 3 tens from 93.
Answer:
93 -30 = 63.

Explanation:
The given question is a tens count subtraction.
First sentence = 93 – 30 = 63.
it is represented with orange color. its a up flow. So, from 93 we count 3 tens up.

Lesson Check

Question 1.
What is 78 − 20? Write the number.
______
Answer:
78 – 20 = 58

Explanation:
First sentence = 78 – 20
it is represented with orange color. its a up flow. So, from 78 we count 2 tens up.

Question 2.
What is 37 + 50? Write the number.
______
Answer:
37 + 50 = 87

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 37 + 50
it is represented with blue color. its a down flow. So, from 37 we count 5 tens down.

Spiral Review
Question 3.
Use the model. What is the difference of 7 − 3? Write the number.

7 – 3 = ______
Answer:
7 – 3 = 4

Explanation:
First sentence = 7 – 3 = 4
it is represented with orange color. its a backward flow. So, from 7 we count 3 ones back to reach 4

Question 4.
What is the sum for 0 + 7? Write the number.
______
Answer:

Explanation:
The given question is a tens count addition and subtraction.
first sentence = 0 + 7 = 7
it is represented with blue color. its a forward flow. So, from 1 we count 6 ones to reach 7.

Lesson 8.10 Practice Addition and Subtraction

Essential Question What different ways can you use to add and subtract?

Listen and Draw

Draw to show the problem. Then solve.

MATHEMATICAL PRACTICES
Describe How did you solve the problem?
Answer:

Model and Draw

What ways have you learned to add and subtract?

Answer:

Share and Show

Add or subtract.
Question 1.
30 + 60 = ______
Answer:

Explanation:
30 =  3 tens
60 = 6 tens
when adding 30+60
we add the tens
3 tens +  6 tens   =  (3+6) tens
9 tens
90.

Question 2.
73 + 5 = ______
Answer:

Explanation:
73 =  7 tens and 3 ones
5 = 5 ones
when adding 73 + 5
we add the ones and keep the tens constant as their is no tens place in the second addend
7 tens + 3 ones +  5 ones  =  7 tens +(3 + 5) ones
7 tens + 8 ones
70 + 8 = 78.

Question 3.
10 – 4 = _____
Answer:
10 – 4 = 6

Explanation:
We subtract the subtrahend from the minuend to get the difference.
10 – 4 = 6
10 is minuend and 40 is subtrahend and 6 is difference of both
10 – 4 = 6

Question 4.
29 + 4 = _____
Answer:

Explanation:
29 + 4
while adding the ones 9 + 4 we are borrowing 1 ones from 4 ones to make it tens.
Remaining 3 ones are added to the tens.
29 + 4
29 +1 +3
30 + 3
33.

Question 5.
9 + 9 = ____
Answer:

Explanation:
9 + 9
while adding the ones 9 +9 we are borrowing 1 ones from 9 ones to make it tens.
Remaining 8 ones are added to the tens.
9 + 9
9 + 1 + 8
10 + 8
18.

Question 6.
5 + 6 = ____
Answer:

Explanation:
5 + 6
while adding the ones 5 + 6 we are borrowing 5 ones from 6 ones to make it tens.
Remaining 1 ones are added to the tens.
5 + 6
5 + 5 + 1
10 + 1
11.

Question 7.
25 + 54 = _____
Answer:

Question 8.
15 – 8 = ______
Answer:
7 + 8 = 15
15 – 8 = 7
Explanation:
We subtract the subtrahend from the minuend to get the difference.
15 – 8 = 7
15 is minuend and 8 is subtrahend and 7 is difference of both
15 – 8 = 7
7.

Question 9.
40 + 10 = _____
Answer:

Question 10.
40 – 10 = _____
Answer:

Explanation:
We subtract the subtrahend from the minuend to get the difference.
40 – 10 = 30
40 is minuend and 10 is subtrahend and 30 is difference of both
ONE line represents tens
1 line = 10
40 – 10 = 30
30 = 3 lines

Question 11.
14 – 7 = _____
Answer:

Explanation:
We subtract the subtrahend from the minuend to get the difference.
14 – 7 = 7
14 is minuend and 7 is subtrahend and 7 is difference of both
14 – 7
7.

Question 12.
90 – 70 = _____
Answer:

Explanation:
We subtract the subtrahend from the minuend to get the difference.
90 – 70
90 is minuend and 70 is subtrahend and 20 is difference of both
ONE line represents tens
1 line = 10
90 – 70 = 20
20.

Question 13.
86 + 12 = _____
Answer:

Question 14.
1 + 9 = _____
Answer:

Question 15.
6 + 7 = _____
Answer:

Explanation:
6 + 7 = 13
while adding the ones 6 + 7  we are borrowing 4 ones from 7 ones to make it tens.
Remaining 3 ones are added to the tens.
6+7
6 + 4 + 3
10 + 3
13.

Question 16.
9 – 2 = _____
Answer:
7 + 2 = 9
9 – 2 = 7

Explanation:
We subtract the subtrahend from the minuend to get the difference.
9 – 2
9 is minuend and 2 is subtrahend and 7 is difference of both
9 – 2
7.

Question 17.
8 + 31 = _____
Answer:

Explanation:
31 =  3 tens and 1 ones
8 = 8 ones
when adding 8 +31
we add the ones and keep the tens constant as their is no tens place in the first addend
8 ones + 3 tens + 1 ones    =  3 tens +(8 + 1) ones
3 tens + 9 ones
30 + 9 = 39.

Question 18.
50 + 11 = _____
Answer:

Explanation:
50 =  5 tens
11 = 1 tens and 1 ones
when adding 50 + 11
we add the tens and keep the ones constant as their is no ones place in the second addend
5 tens + 1 tens + 1 ones   =  (5 + 1) tens +1 ones
6 tens + 1 ones
60 + 1 = 61.

On Your Own

MATHEMATICAL PRACTICE Use Repeated Reasoning Add or subtract.
Question 19.

Answer:
12 – 3 = 9
9 + 3 = 12

Explanation:
We subtract the subtrahend from the minuend to get the difference.
12 – 3 = 9
12 is minuend and 3 is subtrahend and 9 is difference of both
12 – 3 = 9.

Question 20.

Answer:

Question 21.

Answer:

Question 22.

Answer:

Question 23.

Answer:

Question 24.

Answer:

Explanation:
16 + 7
while adding the ones 6 + 7 we are borrowing 4 ones from 7 ones to make it tens.
Remaining 3 ones are added to the tens.
16 + 7
16 + 4 + 3
20 + 3
23.

Question 25.

Answer:

Explanation:
Any number subtracted from the the number itself gives the difference zero.0

Question 26.

Answer:

Explanation:
3 + 8
while adding the ones 3 + 8 we are borrowing 7 ones from 1 ones to make it tens.
Remaining 1 ones are added to the tens.
3 + 8
3 + 7 + 1
10 + 1
11.

Question 27.

Answer:

Question 28.

Answer:

Explanation:
We subtract the subtrahend from the minuend to get the difference.
60 – 30 = 30
60 is minuend and 30 is subtrahend and 30 is difference of both
ONE line represents tens
1 line = 10
60 – 30 = 30
30.

Question 29.

Answer:

Question 30.

Answer:

Question 31.

Answer:

Question 32.

Answer:

Question 33.

Answer:

Question 34.

Answer:

Solve. Write or draw to explain.
Question 35.
THINK SMARTER
Lara collects 8 more stamps than Samson. Samson collects 39 stamps. How many stamps does Lara collect?
______ stamps
Answer:
Number of Stamps Samson collect = 39
Number of Stamps Lara Collect = 8 more than Samson = 8 + 39 = 47

Problem Solving • Applications

Solve. Write or draw to explain.
Question 36.
THINK SMARTER
Jane drew some stars. Then she drew 9 more stars. Now there are 19 stars. How many stars did Jane draw first?

Answer:
Jane drew some stars =x
Jane drew again some more stars = x + 9
Now total Number of stars = 19
Number of stars Jane draw first = x
x + 9 = 19
x =19 – 9 = 10
Number of stars Jane draw first = 10

Question 37.
THINK SMARTER
Adel drew 10 more stars than Charlie. Charlie drew 24 stars. How many stars did Adel draw?
______ stars
Answer:
Number of stars Charlie drew = 24 stars.
Adel drew 10 more stars than Charlie. = 24 + 10 = 34
Number of stars adel draw = 34

Question 38.
GO DEEPER
Write three ways to get a sum of 49.

Answer:
20 + 29 = 49
35 + 14 = 49
40 + 9 = 49

Question 39.
THINK SMARTER
Find the sum of 23 and 30. Use any way to add.
23 + 30 = _______
Explain how you solved the problem.
Answer:
23 + 30 = 53
30 + 23 = 53
Explanation :
Whatever may be the order of addends but the sum always remains the same .

TAKE HOME ACTIVITY • Have your child explain how he or she solved Exercise 36.

Practice Addition and Subtraction Homework & Practice 8.10

Add or subtract.
Question 1.

Answer:

Question 2.

Answer:

Question 3.

Answer:

Question 4.

Answer:

Question 5.

Answer:

Question 6.

Answer:

Question 7.

Answer:

Question 8.

Answer:

Question 9.

Answer:

Question 10.

Answer:

Problem Solving
Solve. Write or draw to explain.
Question 11.
Andrew read 17 pages of his book before dinner. He read 9 more pages after dinner. How many pages did he read?
______ pages
Answer:
Number of pages Andrew read before dinner = 17
Number of pages Andrew read after dinner = 9 more = 9 + 17 = 26
Number of pages Andrew read = 17 + 26 = 43

Question 12.
WRITE
Write two ways you could use to find 5 + 8.
Answer:
5 + 8 = 13
8 + 5 = 13
Explanation :
Whatever may be the order of addends but the sum always remains the same .

Lesson Check
Question 1.
What is the sum of 20 + 18? Write the sum.
20 + 18 = ______
Answer:
20 + 18 = 38
Explanation :
Adding addend 20 and 18  gives the sum 38 .

Question 2.
What is the difference of 90 − 50? Write the difference.
90 – 50 = ______
Answer:
90 – 50 = 40
Explanation :
the Minuend 90 is subtrahend with 50 gives the difference 40

Spiral Review
Question 3.
Use the model. What number sentence does this model show? Write the number sentence that the model shows.

Answer:
10 + 3 = 13

Question 4.
Solve. Mo had some toys. He gave 6 away. Now he has 6 toys. How many toys did Mo start with?
______ toys
Answer:
Number of toys with Mo = x
Number of toys Mo gave = 6 away = x – 6
Number of toys with Mo now = 6
x – 6 = 6
x = 6 + 6 = 12
Number of toys Mo started with = 12

Two-Digit Addition and Subtraction Review/Test

Question 1.
Write each addition or subtraction problem in the box below the answer.

Answer:

Question 2.
Choose all the ways that name the model.

Answer:

Question 3.
Sasha has 70 stickers. She uses 40 of them. How many stickers are left? Show your work.
________ stickers
Answer:
Number of stickers Sasha has = 70
Number of stickers she used = 40
Number of stickers left = 70 – 40 = 30.

Question 4.
THINK SMARTER+
Use the hundred chart to add. Count on by ones or tens.
37 + 5 = ______

Explain how you used the chart to find the sum.
Answer:

37  +  5  = 42.
Sum = 42.

Question 5.
Use the model. Draw to show how to add the tens.

Answer:

Question 6.
Use the model. Draw to show how to make a ten.

Answer:

Question 7.
Write the addition sentence that the model shows. Solve.

Answer:

Question 8.
What is the difference?

Answer:

Question 9.
What is the sum?

Answer:

Question 10.
Luis has 16 .
He has 38
1.
How many leaves does Luis have? Circle the number
that makes the sentence true.
Luis has 2 leaves.
Answer:
Number of leaves Luis has = 16
Number of leaves = 38
Total number of leaves Luis have = 16 + 38 = 54

Question 11.
Match the math sentences that count up and back by tens.

Answer:

Question 12.
GO DEEPER
Find the sum of 62 and 15. Use any way to add.
62 + 15 = _______
Explain how you solved the problem.
Answer: