Lesson: 1 Problem Solving • Add or Subtract

Lesson: 2 Record Related Facts

Lesson: 3 Identify Related Facts

Lesson: 4 Use Addition to Check Subtraction

Mid-Chapter Checkpoint

Lesson: 5 Algebra • Unknown Numbers

Lesson: 6 Algebra • Use Related Facts

Lesson: 7 Choose an Operation

Lesson: 8 Algebra • Ways to Make Numbers to 20

Lesson: 9 Algebra • Equal and Not Equal

Lesson: 10 Facts Practice to 20

Curious George
Children tap the Liberty Bell 4 times. Then they tap it 9 more times. How many times do the children tap the bell?

The number of times children tab the bell = 13 times.

Explanation:
In the above-given question,
given that,
Children tap the liberty bell 4 times.
Then they tap it 9 more times.
4 + 9 = 13.
The number of times children tap the bell = 13 times.

### Addition and Subtraction Relationships Show What You Know

Use . Color to match.
Write each sum.

Question 1.

The number of cubes = 4.

Explanation:
In the above-given question,
given that,
the cubes 1 + 3 = 4.
3 + 1 = 4.
so the number of cubes = 4.

Count On
Use the number line to add. Write each sum.

Question 2.
6 + 3 = _9_

The sum of 6 and 3 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 3.
6 + 3 = 9.
the sum of 6 and 3 = 9.

Question 3.
7 + 1 = _8_

The sum of 7 and 1 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 1.
7 + 1 = 8.
the sum of 7 and 1 = 8.

Question 4.
8 + 2 = _10_

The sum of 8 and 2 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 2.
8 + 2 = 10.
the sum of 8 and 2 = 10.

Count Back
Use the number line to subtract. Write each difference.

Question 5.
11 – 2 = _9_

The difference of 11 and 2 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 2.
11 – 2 = 9.
the difference of 11 and 2 = 9.

Question 6.
8 – 3 = _5_

The difference of 8 and 3 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 3.
8 – 3 = 5.
the difference of 8 and 3 = 5.

Question 7.
9 – 1 = _8_

The difference of 9 and 1 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 1.
9 – 1 = 8.
the difference of 9 and 1 = 8.

### Addition and Subtraction Relationships Vocabulary Builder

Visualize It
Sort the review words from the box.

Understand Vocabulary

Question 1.

The sum of 8 and 2 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 2.
8 + 2 = 10.
the sum of 8 and 2 = 10.

Question 2.
What is the sum?
_10_

The sum of 8 and 2 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 2.
8 + 2 = 10.
the sum of 8 and 2 = 10.

Question 3.
Write a subtraction fact.

The difference of 8 and 3 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 3.
8 – 3 = 5.
the difference of 8 and 3 = 5.

Question 4.
What is the difference?
_5__

The difference of 8 and 3 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 3.
8 – 3 = 5.
the difference of 8 and 3 = 5.

Materials

Play with a partner.
Each player picks or .
1. Mix the addition cards. Each player gets 8 cards. Show your cards faceup.
2. Put the subtraction cards in a pile facedown.
3. Take a subtraction card. Do you have the addition fact that helps you subtract?
4. If so, put the cards together and cover a space with a . If not, you lose a turn.
5. The first player to cover 3 spaces in a row wins.

The difference of 8 and 3 = 5.

Explanation:
In the above-given question,
given that,
totally there are 16 cards.
so each player gets 8 cards.
I am picking the subtraction card.
8 – 3 = 5.

### Addition and Subtraction Relationships Vocabulary Game

Go Fish

Materials
4 sets of word cards

How to Play
Play with two other players.

1. Mix the cards. Give 5 cards to each player. Put the rest in a pile face-down.
2. Ask a player for a word to match a word in your hand.
• If the player has the word, he or she gives the card to you.
• If the player does not have the word, he or she says, “Go fish.” Take a card from the pile.
3. Take turns.
4. When there are no more word cards in the pile, find all the words matched words in your cards. The player with the most matches wins.

The sum of 8 and 3 = 11.

Explanation:
In the above-given question,
given that,
totally there are 10 cards.
so each player gets 85 cards.
I am picking the Addition card.
8 + 3 = 11.

The Write Way

Reflect
Choose one idea. Draw and write about it.
• Max wants to know if the following is correct
3 + 5 = 6 + 2
Draw and write to tell how you know.

The sum of 3 and 5 = 6 and 2.

Explanation:
In the above-given question,
given that,
the numbers are 3 and 5.
the numbers are 6 and 2.
3 + 5 = 8.
6 + 2 = 10.
the sum of 3 and 5 = 6 and 2.

### Lesson 5.1 Problem Solving • Add or Subtract

Essential Question

There are 16 turtles on the beach. Some swim away. Now there are 9 turtles on the beach. How many turtles swim away?

The number of turtles swims away = 7.

Explanation:
In the above-given question,
given that,
There are 16 turtles on the beach.
some swim away.
Now there are 9 turtles on the beach.
16 – 9 = 7.

Unlock the Problem

What do I need to find?

What information do I need to use?

The number of turtles swims away = 7.

Explanation:
In the above-given question,
given that,
There are 16 turtles on the beach.
some swim away.
Now there are 9 turtles on the beach.
16 – 9 = 7.

Show how to solve the problem.

The number of turtles swims away = 7.

Explanation:
In the above-given question,
given that,
There are 16 turtles on the beach.
some swim away.
Now there are 9 turtles on the beach.
16 – 9 = 7.

HOME CONNECTION
• Your child made a model to visualize the problem. The model helps your child see what part of the problem to find.

Try Another Problem

Question 1.
There are 4 rabbits in the garden. Some more rabbits come. Now there are 12 rabbits. How many rabbits come to the garden?

The number of rabbits that come to the garden  = 8.

Explanation:
In the above-given question,
given that,
There are 4 rabbits in the garden.
some more rabbits come.
Now there are 12 rabbits.
8 + 4 = 12.
The number of rabbits that come to the garden  = 8.

Go Math 1st Grade Topic 5 Lesson 5.1 Answer Key Question 2.
There are 14 birds in a tree. Some birds fly away. There are 9 birds still in the tree. How many birds fly away?

The number of birds that fly away  = 5.

Explanation:
In the above-given question,
given that,
There are 14 birds in a tree.
some birds fly away.
There are 9 birds still in the tree.
14 – 9 = 5.
The number of birds that fly away  = 5.

Math Talk
MATHEMATICAL PRACTICES
Model Explain how to find the missing number.

Share and Show MATH BOARD

Make a model to solve.

Question 3.
There are 20 ducks in the pond. Then 10 ducks swim away. How many ducks are still in the pond?

20 ducks 10 swim away _10_ ducks still in the pond

The number of ducks still in the pond = 10.

Explanation:
In the above-given question,
given that,
There are 20 ducks in the pond.
Then 10 ducks swim away.
20 – 10 = 10.
The number of ducks still in the pond  = 10.

Question 4.
THINK SMARTER
3 eagles land in the trees. Now 12 eagles are in the trees. How many eagles were in the trees to start?

The number of eagles was in the trees to start = 9.

Explanation:
In the above-given question,
given that,
3 eagles land in the trees.
now 12 eagles are in the trees.
12 – 3 = 8.
The number of eagles was in the trees to start = 9.

Question 5.
8 squirrels are in the park. Some more squirrels come. Now there are 16 squirrels. How many squirrels come to the park?

The number of squirrels that come to the park =  8.

Explanation:
In the above-given question,
given that,
8 squirrels are in the park.
some more squirrels come.
now there are 16 squirrels.
8 + 8 = 16.
The number of squirrels come to the park = 8.

MATHEMATICAL PRACTICE
Represent a Problem
Solve. Draw or write to show your work.

Question 6.
Liz picks 15 flowers. 7 are pink. The rest are yellow. How many are yellow?

_8_ yellow flowers

The number of flowers that are yellow =  8.

Explanation:
In the above-given question,
given that,
Liz picks 15 flowers.
7 are pink.
the rest are yellow.
15 – 7 = 8.
The number of flowers that are yellow = 8.

Cindy has 14 sand dollars. She has the same number of large and small sand dollars. Write a number sentence about the sand dollars.

The number of small dollars =  7.

Explanation:
In the above-given question,
given that,
Cindy has 14 sand dollars.
she has the same number of large and small dollars.
7 + 7 = 14.
The number of small dollars = 7.

Question 8.
THINK SMARTER
Sam has 3 more books than Ed. Sam has 8 books. How many books does Ed have?
_5_ books

The number of books Ed has = 5.

Explanation:
In the above-given question,
given that,
Sam has 3 more books than Ed.
Sam has 8 books.
8 – 3 = 5.
The number of books Ed has = 5.

Question 9.
THINK SMARTER
There are 7 eggs in a nest. Some eggs hatch. Now there are 5 left. How many eggs hatch?

The number of eggs hatch = 2.

Explanation:
In the above-given question,
given that,
There are 7 eggs in a nest.
some eggs hatch.
now there are 5 left.
7 – 5 = 2.
The number of eggs hatch = 2.

TAKE HOME ACTIVITY
• Ask your child to look at Exercise 7 and use the number 18 as the total number of sand dollars. Then have your child write a number sentence.

The number of small dollars =  9.

Explanation:
In the above-given question,
given that,
Cindy has 18 sand dollars.
she has the same number of large and small dollars.
9 + 9 = 18.
The number of small dollars = 18.

### Problem Solving • Add or Subtract Homework & Practice 5.1

Make a model to solve.

Question 1.
Stan has 12 stickers. Some stickers are new. 4 stickers are old. How many stickers are new?

_8_ new stickers

The number of new stickers =  8.

Explanation:
In the above-given question,
given that,
Stan has 12 stickers.
some stickers are new.
4 stickers are old.
12 – 4 = 8.
The number of new stickers = 8.

Question 2.
Liz has 9 toy bears. Then she buys some more. Now she has 15 toy bears. How many toy bears did she buy?

_6_ toy bears

The number of toy bears did she buy =  6.

Explanation:
In the above-given question,
given that,
The number of small dollars = 7.

Question 3.
Eric buys 6 books. Now he has 16 books. How many books did he have to start?

_10_ books

The number of books did he have to start = 10.

Explanation:
In the above-given question,
given that,
Now he has 16 books.
16 – 6 = 10.
The number of books did he have to start = 10.

Question 4.
WRITE Math

Lesson Check

Use the model to solve.

Question 1.
Arlo has 17 bean bag animals. Some are fuzzy. 9 bean bag animals are not fuzzy. How many animals are fuzzy?
_8_ fuzzy animals

The number of animals that are fuzzy = 8.

Explanation:
In the above-given question,
given that,
Arlo has 17 bean bag animals.
Some are fuzzy.
9 bean bag animals are not fuzzy.
17 – 9 = 8.
The number of animals that are fuzzy = 8.

Spiral Review

Question 2.
Count back 1, 2, or 3. Write the difference.
_8_ = 11 – 3

The difference of 11 and 3 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 3.
11 – 3 = 8.
the difference of 11 and 3 = 8.

The difference of 11 and 2 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 2.
11 – 2 = 9.
the difference of 11 and 2 = 9.

The difference of 11 and 1 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 1.
11 – 1 = 10.
the difference of 11 and 1 = 10.

Question 3.
Use Color to show how to make ten. Complete the addition sentence.

10 = _5_ + _5_

The sum of 5 and 5 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 5.
5 + 5 = 10.
the sum of 5 and 5 = 10.

### Lesson 5.2 Record Related Facts

Essential Question

Listen and Draw

Listen to the problem.
Model with or an i Tool. Draw your model. Write the number sentence.

The difference of 8 and 3 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 3.
8 – 3 = 5.
the difference of 8 and 3 = 5.

The sum of 8 and 3 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 3.
8 + 3 = 11.
the sum of 8 and 3 = 11.

Math Talk
Use Tools Explain how your model helps you write your number sentence.

Share and Show MATH BOARD

Question 1.

The sum of 8 and 7 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 7.
8 + 7 = 15.
the sum of 8 and 7 = 15.

The difference of 15 and 7 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 7.
15 – 7 = 8.
the difference of 15 and 7 = 8.

Go Math Grade 1 Chapter 5 Lesson 5.2 Answer Key Question 2.

The sum of 5 and 9 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 5.
9 + 5 = 14.
the sum of 5 and 9 = 14.

The difference of 14 and 9 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 9.
14 – 9 = 5.
the difference of 14 and 9 = 5.

Question 3.

The sum of 7 and 6 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 6.
7 + 6 = 13.
the sum of 7 and 6 = 13.

The difference of 13 and 6 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 6.
13 – 6 = 7.
the difference of 13 and 6 = 7.

MATHEMATICAL PRACTICE

Analyze Relationships
Use Add or subtract. Complete the related facts.

Question 4.

The sum of 5 and 8 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 5.
8 + 5 = 13.
the sum of 5 and 8 = 13.

The difference of 13 and 5 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 5.
13 – 5 = 8.
the difference of 13 and 5 = 8.

Question 5.

The sum of 8 and 9 = 17.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 8.
9 + 8 = 17.
the sum of 8 and 9 = 17.

The difference of 17 and 8 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 8.
17 – 8 = 9.
the difference of 17 and 8 = 9.

Question 6.

The sum of 6 and 9 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 6.
9 + 6 = 15.
the sum of 6 and 9 = 15.

The difference of 15 and 6 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 6.
15 – 6 = 9.
the difference of 15 and 6 = 9.

Question 7.
THINK SMARTER
Circle the number sentence that has a mistake. Correct it to complete the related facts.
7 + 9 = 16
16 + 9 = 7
9 + 7 = 16
16 – 7 =9

The number sentence that has a mistake is 16 + 9 = 7.

In the above-given question,
given that,
the number of sentences that are correct.
7 + 9 = 16.
9 + 7 = 16.
16 – 7 = 9.
16 – 9 = 7.
The number sentence that has a mistake is 16 + 9 = 7.

Problem Solving • Applications

Question 8.
GO DEEPER
Choose three numbers to make related facts. Choose numbers between 0 and 18. Write your numbers. Write the related facts.

The number sentence that has a mistake is 16 + 9 = 7.

In the above-given question,
given that,
the number of sentences that are correct.
7 + 9 = 16.
9 + 7 = 16.
16 – 7 = 9.
16 – 9 = 7.
The number sentence that has a mistake is 16 + 9 = 7.

Question 9.
THINK SMARTER
Which fact is a related fact?

The related fact = 9 – 6 = 3.

Explanation:
In the above-given question,
given that,
the numbers are 6 + 3 = 9.
3 + 6 = 9.
9 – 3 = 6.
The related fact is 9 – 6 = 3.

TAKE HOME ACTIVITY

### Record Related Facts Homework & Practice 5.2

Use Add or subtract. Complete the related facts.

Question 1.

The sum of 8 and 4 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 8.
4 + 8 = 12.
the sum of 8 and 4 = 12.

The difference of 12 and 8 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 12 and 8.
12 – 8 = 4.
the difference of 12 and 8 = 4.

Go Math Grade 1 Chapter 5 Pdf Lesson 5.2 Enrich Answer Key Question 2.

The sum of 5 and 4 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 4.
5 + 4 = 9.
the sum of 5 and 4 = 9.

The difference of 9 and 4 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 5.
9 – 5 = 4.
the difference of 9 and 4 = 5.

Problem Solving

Choose a way to solve. Write or draw to explain.

Question 3.
There are 16 apples on the tree. No apples fall off. How many apples are still on the tree?

The number of apples still on the tree =  16.

Explanation:
In the above-given question,
given that,
There are 16 apples on the tree.
no apples fall off.
The number of apples still on the tree = 16.

Question 4.
Math Write four related facts. Use pictures to show how the number sentences are related.

__________________
__________________

The sum of 5 and 4 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 4.
5 + 4 = 9.
the sum of 5 and 4 = 9.

The difference of 9 and 4 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 5.
9 – 5 = 4.
the difference of 9 and 4 = 5.

Lesson Check

Question 1.
Write a related fact.

The sum of 7 and 4 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 4.
7 + 4 = 11.
the sum of 7 and 4 = 11.

The difference of 11 and 7 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 7.
11 – 7 = 4.
the difference of 11 and 7 = 4.

Spiral Review

Question 2.
Complete the subtraction sentence.
6 – 6 = _0_

The difference of 6 and 6 = 0.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 6.
6 – 6 = 0.
the difference of 6 and 6 = 0.

Question 3.
Write an addition sentence that helps you solve 15 − 9
_6_ + _9_ = _15_

The difference of 15 and 9 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 9.
15 – 9 = 6.
the difference of 15 and 9 = 6.

### Lesson 5.3 Identify Related Facts

Essential Question
How do you know if addition and subtraction facts are related?

Listen and Draw

Use to show 4 + 9 = 13.
Draw to show a related subtraction fact.
Write the subtraction sentence.

The difference of 9 and 13 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 13.
13 – 9 = 4.
the difference of 13 and 9 = 4.

Math Talk
MATHEMATICAL PRACTICES
Look for Structure Why is your subtraction sentence related to 4 + 9 = 13?

The difference of 9 and 13 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 13.
13 – 9 = 4.
the difference of 13 and 9 = 4.

Share and Show MATH BOARD

Circle the related facts

Question 1.
6 + 4 = _10_
10 – 4 =_6_

The sum of 6 and 4 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 6.
4 + 6 = 10.
the sum of 6 and 4 = 10.

The difference of 10 and 4 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 10 and 4.
10 – 4 = 6.
the difference of 10 and 4 = 6.

Question 2.
_17_ = 9 + 8
_9_ = 17 – 8

The sum of 8 and 9 = 17.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 8.
9 + 8 = 17.
the sum of 8 and 9 = 17.

The difference of 17 and 8 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 8.
17 – 8 = 9.
the difference of 17 and 8 = 9.

Question 3.
9 + 5 = _14_
9 – 5 = _4_

The sum of 9 and 5 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 5.
9 + 5 = 14.
the sum of 9 and 5 = 14.

The difference of 9 and 5 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 5.
9 – 5 = 4.
the difference of 9 and 5 = 4.

Question 4.
8 + 7 = _15_
15 – 7 = _8_

The sum of 8 and 7 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 8.
7 + 8 = 15.
the sum of 8 and 7 = 15.

The difference of 15 and 7 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 7.
15 – 7 = 8.
the difference of 15 and 7 = 8.

Question 5.
_11_ = 9 + 2
_7_ = 9 – 2

The sum of 9 and 2 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 2.
9 + 2 = 11.
the sum of 9 and 2 = 11.

The difference of 9 and 2 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 2.
9 – 2 = 7.
the difference of 9 and 2 = 7.

Question 6.
6 + 3 = _9_
12 – 3 = _9_

The sum of 6 and 3 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 3.
6 + 3 = 9.
the sum of 6 and 3 = 9.

The difference of 12 and 3 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 12 and 3.
12 – 3 = 9.
the difference of 12 and 3 = 9.

Question 7.
4 + 8 = _12_
12 – 8 = _4_

The sum of 8 and 4 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 8.
4 + 8 = 12.
the sum of 8 and 4 = 12.

The difference of 12 and 8 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 12 and 8.
12 – 8 = 4.
the difference of 12 and 8 = 4.

Question 8.
_13_ = 7 + 6
_7_ = 13 – 6

The sum of 7 and 6 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 6.
7 + 6 = 13.
the sum of 7 and 6 = 13.

The difference of 13 and 6 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 6.
13 – 6 = 7.
the difference of 13 and 6 = 7.

Question 9.
9 + 9 = _18_
18 – 9 = _9_

The sum of 9 and 9 = 18.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 9.
9 + 9 = 18.
the sum of 9 and 9 = 18.

The difference of 18 and 9 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 18 and 9.
18 – 9 = 9.
the difference of 18 and 9 = 9.

Question 10.
MATHEMATICAL PRACTICE
Identify Relationships Add and subtract. Color the leaves that have related facts.

The sum of 8 and 4 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 8.
4 + 8 = 12.
the sum of 8 and 4 = 12.

The difference of 8 and 4 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 4.
8 – 4 = 4.
the difference of 8 and 4 = 4.

The sum of 8 and 9 = 17.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 8.
9 + 8 = 17.
the sum of 8 and 9 = 17.

The difference of 17 and 8 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 8.
17 – 8 = 9.
the difference of 17 and 8 = 9.

The sum of 10 and 10 = 20.

Explanation:
In the above-given question,
given that,
the numbers are 10 and 10.
10 + 10 = 20.
the sum of 10 and 10 = 20.

The difference of 20 and 10 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 20 and 10.
20 – 10 = 10.
the difference of 20 and 10 = 10.

The sum of 9 and 4 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 9.
4 + 9 = 13.
the sum of 9 and 4 = 13.

The difference of 13 and 4 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 4.
13 – 4 = 8.
the difference of 13 and 4 = 8.

Problem Solving • Applications WRITE Math

GO DEEPER
Use the numbers to write related addition and subtraction sentences.

Question 11.

The sum of 5 and 4 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 5.
4 + 5 = 9.
the sum of 5 and 4 = 9.

The difference of 9 and 5 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 5.
9 – 5 = 4.
the difference of 9 and 5 = 4.

Question 12.

The sum of 5 and 7 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 7.
5 + 7 = 12.
the sum of 5 and 7 = 12.

The difference of 12 and 7 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 12 and 7.
12 – 7 = 5.
the difference of 12 and 7 = 5.

Question 13.

The sum of 8 and 5 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 8.
5 + 8 = 13.
the sum of 8 and 5 = 13.

The difference of 13 and 8 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 8.
13 – 8 = 5.
the difference of 13 and 8 = 5.

Question 14.
THINK SMARTER
Which number cannot be used to write related number sentences? Explain.

Question 15.
THINK SMARTER
Look at the facts. Are they related facts? Choose Yes or No.

Yes, they are related facts.

In the above-given question,
given that,
the numbers are 13 – 8 = 5.
5 + 8 = 13.
Yes, they are related facts.

TAKE HOME ACTIVITY
• Write 7, 9, 16, +, −, and = on separate slips of paper. Have your child use the slips of paper to show related facts.

The sum of 7 and 9 = 16.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 9.
7 + 9 = 16.
the sum of 7 and 9 = 16.

The difference of 16 and 9 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 16 and 9.
16 – 9 = 7.
the difference of 16 and 9 = 7.

### Identify Related Facts Homework & Practice 5.3

Circle the related facts.

Question 1.
5 + 6 = _11_
11 – 6 = _5_

The sum of 6 and 5 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 6.
5 + 6 = 11.
the sum of 6 and 5 = 11.

The difference of 11 and 6 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 6.
11 – 6 = 5.
the difference of 11 and 6 = 5.

Go Math Grade 1 Chapter 5 Pdf Lesson 3 Homework 5.1 Answer Key Question 2.
4 + 9 = _13_
9 – 4 = _5_

The sum of 4 and 9 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 9.
4 + 9 = 13.
the sum of 4 and 9 = 13.

The difference of 9 and 4 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 4.
9 – 4 = 5.
the difference of 9 and 4 = 5.

Question 3.
4 + 7 = _11_
11 – 7 = _4_

The sum of 7 and 4 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 4.
7 + 4 = 11.
the sum of 7 and 4 = 11.

The difference of 11 and 7 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 7.
11 – 7 = 4.
the difference of 11 and 7 = 4.

Question 4.
9 + 8 = _17_
17 – 8 = _9_

The sum of 8 and 9 = 17.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 8.
9 + 8 = 17.
the sum of 8 and 9 = 17.

The difference of 17 and 8 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 8.
17 – 8 = 9.
the difference of 17 and 8 = 9.

Question 5.
5 + 7 = _12_
7 – 5 = _2_

The sum of 7 and 5 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 7.
5 + 7 = 12.
the sum of 7 and 5 = 12.

The difference of 7 and 5 = 2.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 5.
7 – 5 = 2.
the difference of 7 and 5 = 2.

Question 6.
6 + 8 = _14_
14 – 8 = _6_

The sum of 8 and 6 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 8.
6 + 8 = 14.
the sum of 8 and 6 = 14.

The difference of 14 and 8 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 8.
14 – 8 = 6.
the difference of 14 and 8 = 6.

Problem Solving

Question 7.
Use the numbers to write related addition and subtraction sentences.

The sum of 8 and 7 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 8.
7 + 8 = 15.
the sum of 8 and 7 = 15.

The difference of 15 and 8 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 8.
15 – 8 = 7.
the difference of 15 and 8 = 7.

Question 8.
WRITE Math
Use numbers and pictures to show related facts with the numbers 7, 9, and 16.

The sum of 7 and 9 = 16.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 9.
7 + 9 = 16.
the sum of 7 and 9 = 16.

The difference of 16 and 9 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 16 and 9.
16 – 9 = 7.
the difference of 16 and 9 = 7.

Lesson Check

Question 1.
Write a related fact for 7 + 6 = 13.

The difference of 13 and 6 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 6.
13 – 6 = 7.
the difference of 13 and 6 = 7.

Spiral Review

Question 2.
Draw lines to match. Subtract to compare. How many fewer than are there?

The number of fewer leaves = 1.

Explanation:
In the above-given question,
given that,
There are 8 penguins.
7 leaves.
8 – 7 = 1.
The number of fewer leaves = 1.

Question 3.

The sum of 8 and 7 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 8.
7 + 8 = 15.
the sum of 8 and 7 = 15.

### 5.4 Use Addition to Check Subtraction

Essential Question
How can you use addition to check subtraction?

Listen and Draw

Draw and write to solve the problem.

The sum of 8 and 7 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 8.
7 + 8 = 15.
the sum of 8 and 7 = 15.

The difference of 15 and 7 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 7.
15 – 7 = 8.
the difference of 15 and 7 = 8.

Math Talk
MATHEMATICAL PRACTICES
Look for Structure Does Erin get all her books back? Use the number sentences to explain how you know.

Share and Show MATH BOARD

Question 1.

The difference of 13 and 7 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 7.
13 – 7 = 6.
the difference of 13 and 7 = 6.

The sum of 6 and 7 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 7.
6 + 7 = 13.
the sum of 6 and 7 = 13.

Question 2.

The difference of 14 and 5 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 5.
14 – 5 = 9.
the difference of 14 and 5 = 9.

The sum of 9 and 5 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 5.
9 + 5 = 14.
the sum of 9 and 5 = 14.

Go Math 1st Grade Lesson 4 Homework 5.3 Question 3.

The difference of 12 and 5 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 12 and 5.
12 – 5 = 7.
the difference of 12 and 5 = 7.

The sum of 5 and 7 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 7.
5 + 7 = 12.
the sum of 5 and 7 = 12.

Question 4.

The difference of 17 and 9 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 9.
17 – 9 = 8.
the difference of 17 and 9 = 8.

The sum of 8 and 9 = 17.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 8.
9 + 8 = 17.
the sum of 8 and 9 = 17.

MATHEMATICAL PRACTICE

Question 5.

The difference of 11 and 3 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 3.
11 – 3 = 8.
the difference of 11 and 3 = 8.

The sum of 8 and 3 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 3.
8 + 3 = 11.
the sum of 8 and 3 = 11.

Question 6.

The difference of 13 and 9 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 9.
13 – 9 = 7.
the difference of 13 and 9 = 7.

The sum of 9 and 7 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 7.
9 + 7 = 13.
the sum of 9 and 7 = 13.

Question 7.
THINK SMARTER
Brianna has 13 sand dollars. Some sand dollars are broken. 5 sand dollars are not broken. Write number sentences about the sand dollars.

The number of sand dollars is not broken = 8.

Explanation:
In the above-given question,
given that,
Brianna has 13 sand dollars.
some sand dollars are broken.
5 sand dollars are not broken.
13 – 5 = 8.
The number of sand dollars is not broken = 8.

Question 8.
GO DEEPER
Liam took 15 balloons to the party. All but 6 of the balloons were red. How many balloons were red?
_6_ red balloons

The number of red balloons = 6.

Explanation:
In the above-given question,
given that,
Liam took 15 balloons to the party.
All but 6 of the balloons were red.
15 – 6 = 8.
The number of red balloons = 6.

TAKE HOME ACTIVITY
• Write 11 − 7 = ☐ on a sheet of paper. Ask your child to find the difference and then write an addition sentence he or she can use to check the subtraction.

The difference of 11 and 7 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 7.
11 – 7 = 4.
the difference of 11 and 7 = 4.

The sum of 7 and 4 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 4.
7 + 4 = 11.
the sum of 7 and 4 = 11.

### Use Addition to Check Subtraction Homework & Practice 5.4

Question 1.

The difference of 12 and 4 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 12 and 4.
12 – 4 = 8.
the difference of 12 and 4 = 8.

The sum of 8 and 4 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 8.
4 + 8 = 12.
the sum of 8 and 4 = 12.

The difference of 15 and 9 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 9.
15 – 9 = 6.
the difference of 15 and 9 = 6.

The sum of 6 and 9 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 6.
9 + 6 = 15.
the sum of 6 and 9 = 15.

Problem Solving

Subtract.

Question 3.
There are 13 grapes in a bowl. Justin ate some of them. Now there are only 7 grapes left. How many grapes did Justin eat?
_13_ – _7_ = _6_
_13_ – _6_ = _7_
_6_ grapes

The number of grapes Justin eats = 6.

Explanation:
In the above-given question,
given that,
There are 13 grapes in a bowl.
Justin ate some of them.
Now there are only 7 grapes left.
13 – 7 = 6.
The number of grapes Justin eats = 6.

Question 4.
WRITE Math

The difference of 12 and 9 = 3.

Explanation:
In the above-given question,
given that,
the numbers are 12 and 9.
12 – 9 = 3.
the difference of 12  and 9 = 3.

The sum of 9 and 3 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 3.
9 + 3 = 11.
the sum of 9 and 3 = 11.

Lesson Check

Question 1.
11 – 3 = ☐
_8_ + _3_ = _11__

The difference of 11 and 3 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 3.
11 – 3 = 8.
the difference of 11 and 3 = 8.

The sum of 8 and 3 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 3.
8 + 3 = 11.
the sum of 8 and 3 = 11.

Go Math 1st Grade Chapter 5 Test Question 2.
12 – 8 = ☐
_8_ + _4_ = __12_

The difference of 12 and 8 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 12 and 8.
12 – 8 = 4.
the difference of 12 and 8 = 4.

The sum of 8 and 4 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 4.
8 + 4 = 12.
the sum of 8 and 4 = 12.

Spiral Review

Question 3.
Jonas picks 10 peaches. 4 peaches are small. The rest are big. How many are big?

_6_ big peaches

The number of big peaches = 6.

Explanation:
In the above-given question,
given that,
Jonas picks 10 peaches.
4 peaches are small.
The number of big peaches = 6.

Question 4.

__________
__________

The sum of 6 and 4 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 4.
3 + 3 + 4 = 10.
the sum of 6 and 4 = 10.

### Addition and Subtraction Relationships Mid-Chapter Checkpoint

Complete the related facts.

Question 1.

The sum of 6 and 8 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 8.
6 + 8 = 14.
the sum of 6 and 8 = 14.

The difference of 14 and 8 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 8.
14 – 8 = 6.
the difference of 14 and 8 = 6.

Question 2.

The sum of 7 and  6 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 6.
7 + 6 = 11.
the sum of 7 and 6 = 11.

The difference of 11 and 6 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 6.
11 – 6 = 7.
the difference of 11 and 6 = 7.

Add and subtract. Circle the related facts.

Question 3.
9 + 3 = _12_
9 – 3 = _6_

The sum of 9 and 3 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 3.
9 + 3 = 12.
the sum of 9 and 3 = 12.

The difference of 9 and 3 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 3.
9 – 3 = 6.
the difference of 9 and 3 = 6.

Question 4.
7 + 8 = _15_
15 – 8 = _7_

The sum of 7 and 8 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 8.
7 + 8 = 15.
the sum of 7 and 8 = 15.

The difference of 15 and 8 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 8.
15 – 8 = 7.
the difference of 15 and 8 = 7.

Question 5.
_11_ = 6 + 5
_1_ = 6 – 5

The sum of 6 and 5 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 5.
6 + 5 = 11.
the sum of 6 and 5 = 11.

The difference of 6 and 5 = 1.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 5.
6 – 5 = 1.
the difference of 6 and 5 = 1.

Question 6.
THINK SMARTER
Complete the subtraction. Then write an addition sentence to check the subtraction.

The difference of 11 and 2 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 2.
11 – 2 = 9.
the difference of 11 and 2 = 9.

### Lesson 5.5 Algebra • Unknown Numbers

Essential Question
How can you use a related fact to find an unknown number?

Listen to the problem. Use to show the story. Draw to show your work

The difference of 6 and 5 = 1.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 5.
6 – 5 = 1.
the difference of 6 and 5 = 1.

Math Talk
MATHEMATICAL PRACTICES
Describe How many toy cars are blue? Explain how you got your answer

Share and Show MATH BOARD

Use to find the unknown numbers. Write the numbers.

Question 1.
8 + ☐ = 15
15 – 8 = ☐

The sum of 8 and 7 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 7.
8 + 7 = 15.
the sum of 8 and 7 = 15.

The difference of 15 and 8 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 8.
15 – 8 = 7.
the difference of 15 and 8 = 7.

Question 2.
13 = 9 + ☐
☐ = 13 – 9

The sum of 9 and 4 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 4.
9 + 4 = 13.
the sum of 9 and 4 = 13.

The difference of 13 and 9 = 4.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 9.
13 – 9 = 4.
the difference of 13 and 9 = 4.

Question 3.
5 + ☐ = 14
14 – 5 = ☐

The sum of 5 and 9 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 9.
5 + 9 = 14.
the sum of 5 and 9 = 14.

The difference of 14 and 5 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 5.
14 – 5 = 9.
the difference of 14 and 5 = 9.

Go Math Grade 1 Chapter 5 Test Pdf Lesson 5 Homework 5.6 Answer Key Question 4.
14 = 6 + ☐
☐ = 14 – 6

The sum of 6 and 9 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 9.
6 + 9 = 14.
the sum of 6 and 9 = 14.

The difference of 14 and 6 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 6.
14 – 6 = 9.
the difference of 14 and 6 = 9.

Question 5.
9 + ☐ = 16
16 – 9 = ☐

The sum of 9 and 7 = 16.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 7.
9 + 7 = 16.
the sum of 9 and 7 = 16.

The difference of 16 and 9 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 16 and 9.
16 – 9 = 7.
the difference of 16 and 9 = 7.

Question 6.
17 = 8 + ☐
☐ = 17 – 8

The sum of 8 and 9 = 17.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 9.
8 + 9 = 17.
the sum of 8 and 9 = 17.

The difference of 17 and 8 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 8.
17 – 8 = 9.
the difference of 17 and 8 = 9.

MATHEMATICAL PRACTICE

Identify Relationships Write the unknown numbers. Use if you need to.

Question 7.
7 + ☐ = 15
15 – 7 = ☐

The sum of 8 and 7 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 7.
8 + 7 = 15.
the sum of 8 and 7 = 15.

The difference of 15 and 7 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 7.
15 – 7 = 8.
the difference of 15 and 7 = 8.

Question 8.
5 + ☐ = 11
11 – 5 = ☐

The sum of 5 and 6 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 6.
5 + 6 = 11.
the sum of 5 and 6 = 11.

The difference of 11 and 5 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 5.
11 – 5 = 6.
the difference of 11 and 5 = 6.

Question 9.
☐ + 10 = 20
20 – 10 = ☐

The sum of 10 and 10 = 20.

Explanation:
In the above-given question,
given that,
the numbers are 10 and 10.
10 + 10 = 20.
the sum of 10 and 10 = 20.

The difference of 20 and 10 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 20 and 10.
20 – 10 = 10.
the difference of 20 and 10 = 10.

Question 10.
☐ + 9 = 16
16 – 9 = ☐

The sum of 9 and 7 = 16.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 7.
9 + 7 = 16.
the sum of 9 and 7 = 16.

The difference of 16 and 9 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 16 and 9.
16 – 9 = 7.
the difference of 16 and 9 = 7.

Question 11.
☐ = 9 + 9
9 = ☐ – 9

The sum of 9 and 9 = 18.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 9.
9 + 9 = 18.
the sum of 9 and 9 = 18.

The difference of 18 and 9 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 18 and 9.
18 – 9 = 9.
the difference of 18 and 9 = 9.

Question 12.
☐ = 5 + 8
5 = ☐ – 8

The sum of 5 and 8 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 5.
8 + 5 = 13.
the sum of 8 and 5 = 13.

The difference of 8 and 5 = 3.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 8.
8 – 5 = 3.
the difference of 8 and 5 = 3.

Question 13.
THINK SMARTER
Solve. Rick has 10 party hats. He needs 19 hats for his party. How many more party hats does Rick need?

_9_ party hats

The number of party hats Rick needs = 9.

Explanation:
In the above-given question,
given that,
Rick has 10 party hats.
He needs 19 hats for his party.
19 – 10 = 9.
The number of party hats Rick needs = 9.

Problem Solving • Applications WRITE Math

Use cubes or draw a picture to solve.

Question 14.
Todd has 12 bunnies. He gives 4 bunnies to his sister. How many bunnies does Todd have now?

_8_ bunnies

The number of bunnies does Todd has = 8.

Explanation:
In the above-given question,
given that,
Todd has 12 bunnies.
He gives 4 bunnies to his sister.
12 – 4 = 8.
The number of bunnies does Todd has = 8.

Go Math Grade 1 Chapter 5 Review Test Answer Key Question 15.
Brad has 11 trucks. Some are small trucks. 4 are big trucks. How many small trucks does he have?

_7_ small trucks

The number of small trucks = 7.

Explanation:
In the above-given question,
given that,
Some are small trucks.
4 are big trucks.
11 – 4 = 7.
The number of small trucks = 7.

Question 16.
GO DEEPER
There are 15 children at the park. 6 of the children go home. Then 4 more children come to the park. How many children are in
the park now?

_13_ children

The number of children is in the park = 13.

Explanation:
In the above-given question,
given that,
There are 15 children at the park.
6 of the children go home.
Then 4 more children come to the park.
15 – 6 + 4.
9 + 4 = 13.
The number of children is in the park = 13.

Question 17.
THINK SMARTER
Use to find the unknown numbers. Write the numbers.

9 + _8_ = 17
17 – 9 = _8_

The sum of 9 and 8 = 17.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 8.
9 + 8 = 17.
the sum of 9 and 8 = 17.

The difference of 17 and 9 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 9.
17 – 9 = 8.
the difference of 17 and 9 = 8.

TAKE HOME ACTIVITY
• Have your child explain how using subtraction can help him or her find the unknown number in 7 + ☐ = 16.

The sum of 7 and 9 = 16.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 9.
7 + 9 = 16.
the sum of 7 and 9 = 16.

The difference of 16 and 9 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 16 and 9.
16 – 9 = 7.
the difference of 16 and 9 = 7.

### Algebra • Unknown Numbers Homework & Practice 5.5

Write the missing numbers. Use if you need to.

Question 1.
6 + ☐ = 13
13 – 6 = ☐

The sum of 6 and 7 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 7.
6 + 7 = 13.
the sum of 6 and 7 = 13.

The difference of 13 and 6 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 6.
13 – 6 = 7.
the difference of 13 and 6 = 7.

Question 2.
9 + ☐ = 14
14 – 9 = ☐

The sum of 9 and 5 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 5.
9 + 5 = 14.
the sum of 9 and 5 = 14.

The difference of 14 and 9 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 9.
14 – 9 = 5.
the difference of 14 and 9 = 5.

Question 3.
☐ + 7 = 15
15 – 7 = ☐

The sum of 7 and 8 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 7.
8 + 7 = 15.
the sum of 8 and 7 = 15.

The difference of 15 and 7 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 7.
15 – 7 = 8.
the difference of 15 and 7 = 8.

Question 4.
☐ = 8 + 8
8 = ☐ – 8

The sum of 8 and 8 = 16.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 8.
8 + 8 = 16.
the sum of 8 and 8 = 16.

The difference of 16 and 8 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 16 and 8.
16 – 8 = 8.
the difference of 8 and 8 = 16.

Problem Solving

Use cubes or draw a picture to solve.

Question 5.
Sally has 9 toy trucks. She gets 3 more toy trucks. How many toy trucks does she have now?
_12_ toy trucks

The number of trucks she has now = 12.

Explanation:
In the above-given question,
given that,
Sally has 9 toy trucks.
She gets 3 more toy trucks.
9 + 3 = 12.
The number of trucks she has now = 12.

Question 6.
WRITE Math
Use words, pictures, or numbers to show how to find the unknown numbers for 8 + _9_ = 17 and 17 – 8 = _9_.

The sum of 9 and 8 = 17.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 9.
8 + 9 = 17.
the sum of 8 and 9 = 17.

The difference of 17 and 8 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 8.
17 – 8 = 9.
the difference of 17 and 8 = 9.

Lesson Check

Question 1.
Write the unknown number.
9 + ☐ = 16

The sum of 9 and 7 = 16.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 9.
7 + 9 = 16.
the sum of 7 and 9 = 16.

Spiral Review

Question 2.
What is 14 − 6?

The difference of 14 and 6 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 6.
14 – 6 = 8.
the difference of 14 and 6 = 8.

Question 3.
Draw circles to show the number. Write the sum. 0 + 8

0 + 8 = _8_

The sum of 0 and 8 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 0 and 8.
0 + 8 = 8.
the sum of 0 and 8 = 8.

### Lesson 5.6 Algebra • Use Related Facts

Essential Question
How can you use a related fact to find an unknown number?

Listen and Draw

What number can you add to 8 to get 10? Draw a picture to solve. Write the unknown number.

8 + ☐ = 10

The number is 2.

Explanation:
In the above-given question,
given that,
10 – 8 = 2.
The number is 2.

Math Talk
MATHEMATICAL PRACTICES
Model Describe how to solve this problem using cubes.

Share and Show MATH BOARD

Write the unknown numbers.

Question 1.
Find 14 – 8.

8 + _6_ = 14
14 – 8 = _6_

The sum of 6 and 8 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 9.
8 + 6 = 14.
the sum of 8 and 6 = 14.

The difference of 14 and 8 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 6.
14 – 8 = 6.
the difference of 14 and 8 = 6.

Question 2.
Find 17 − 8

8 + _9_ = 17
17 − 8 = _9_

The sum of 9 and 8 = 17.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 9.
8 + 9 = 17.
the sum of 8 and 9 = 17.

The difference of 17 and 8 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 8.
17 – 8 = 9.
the difference of 17 and 8 = 9.

Find 11 − 6.

6 + _5_ = 11
11 – 6 = _5_

The sum of 6 and 5 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 5.
6 + 5 = 11.
the sum of 6 and 5 = 11.

The difference of 11 and 6 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 6.
11 – 6 = 5.
the difference of 11 and 6 = 5.

Question 4.
Find 15 − 9

9 + _6_ = 15
15 − 9 = _6_

The sum of 9 and 6 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 9.
6 + 9 = 15.
the sum of 6 and 9 = 15.

The difference of 15 and 9 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 9.
15 – 9 = 6.
the difference of 15 and 9 = 6.

Write the unknown numbers.

Question 5.
Find 20 − 10.

10 + _10_ = 20
20 – 10 = _10_

The sum of 10 and 10 = 20.

Explanation:
In the above-given question,
given that,
the numbers are 10 and 10.
10 + 10 = 20.
the sum of 10 and 10 = 20.

The difference of 20 and 10 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 20 and 10.
20 – 10 = 10.
the difference of 20 and 10 = 10.

Question 6.
Find 13 − 4.

4 + _9_ = 13
13 – 4 = _9_

The sum of 4 and 9 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 9.
4 + 9 = 13.
the sum of 4 and 9 = 13.

The difference of 13 and 4 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 4.
13 – 4 = 9.
the difference of 13 and 4 = 9.

Question 7.
Find 12 − 7.

7 + _5_ = 12
12 – 7 = _5_

The sum of 7 and 5 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 5.
7 + 5 = 12.
the sum of 7 and 5 = 12.

The difference of 12 and 7 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 12 and 7.
12 – 7 = 5.
the difference of 12 and 7 = 5.

Question 8.
Find 15 − 8.

8 + _7_ = 15
15 – 8 = _7_

The sum of 7 and 8 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 7.
8 + 7 = 15.
the sum of 8 and 7 = 15.

The difference of 15 and 8 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 8.
15 – 8 = 7.
the difference of 15 and 8 = 7.

GO DEEPER
Write an addition sentence to help you find the difference. Then write the related subtraction sentence to solve.

Question 9.
Find 11 − 5.
_5_ + _6_ = _11_
_6_ + _5_ = _11_

The sum of 6 and 5 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 5.
6 + 5 = 11.
the sum of 6 and 5 = 11.

The sum of 5 and 6 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 6.
5 + 6 = 11.
the sum of 5 and 6 = 11.

The difference of 11 and 5 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 5.
11 – 5 = 6.
the difference of 11 and 5 = 6.

Question 10.
Find 13 − 6.
_6_ + _7_ = _13_
_7_ + _6_ = _13_

The sum of 6 and 7 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 7.
6 + 7 = 13.
the sum of 6 and 7 = 13.

The sum of 7 and 6 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 6.
7 + 6 = 13.
the sum of 7 and 6 = 13.

The difference of 13 and 6 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 6.
13 – 6 = 7.
the difference of 13 and 6 = 7.

Problem Solving • Applications

Reason Abstractly Look at the shapes in the addition sentence. Draw shapes to show a related subtraction fact.

Question 11.

The sum of 6 and 8 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 9.
8 + 6 = 14.
the sum of 8 and 6 = 14.

The difference of 14 and 8 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 6.
14 – 8 = 6.
the difference of 14 and 8 = 6.

Question 12.

The sum of 5 and 8 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 5.
8 + 5 = 13.
the sum of 8 and 5 = 13.

The difference of 8 and 5 = 3.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 8.
8 – 5 = 3.
the difference of 8 and 5 = 3.

Question 13.
THINK SMARTER

The sum of 7 and 8 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 7.
8 + 7 = 15.
the sum of 8 and 7 = 15.

The difference of 15 and 7 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 7.
15 – 7 = 8.
the difference of 15 and 7 = 8.

Question 14.
THINK SMARTER
Which is the unknown number in these related facts?

The unknown number is 7.

Explanation:
In the above-given question,
Given that,
The numbers are 5, 7, 8, and 9.
The unknown number is 7.

TAKE HOME ACTIVITY
• Give your child 5 small objects, such as paper clips. Then ask your child how many more objects he or she would need to have 12.

### • Use Related Facts Homework & Practice 5.6

Write the missing numbers.

Question 1.
Find 16 − 9.

The unknown number is 7.

Explanation:
In the above-given question,
Given that,
The sum of 9 and 7 = 16.
the difference of 16 and 9 = 7.
The unknown number is 7.

Go Math Pdf Grade 1 Lesson 6 Homework 5.1 Answer Key Question 2.
Find 12 − 7

The unknown number is 5.

Explanation:
In the above-given question,
Given that,
The sum of 5 and 7 = 12.
the difference of 12 and 7 = 5.
The unknown number is 5.

Question 3.
Find 15 − 6.

The unknown number is 9.

Explanation:
In the above-given question,
Given that,
The sum of 9 and 6 = 15.
the difference of 15 and 6 = 9.
The unknown number is 9.

Question 4.
Find 18 − 9.

The unknown number is 9.

Explanation:
In the above-given question,
Given that,
The sum of 9 and 9 = 18.
the difference of 18 and 9 = 9.
The unknown number is 9.

Problem Solving

Look at the shapes in the addition sentence. Draw a shape to show a related subtraction fact.

Question 5.

The sum of 7 and 8 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 7.
8 + 7 = 15.
the sum of 8 and 7 = 15.

The difference of 15 and 7 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 7.
15 – 7 = 8.
the difference of 15 and 7 = 8.

Question 6.
WRITE Math
Draw pictures to show how to solve 14 – 7 = _7__ and 7 + _7__ = 14.

The sum of 7 and  7 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 7.
7 + 7 = 14.
the sum of 7 and 7 = 14.

The difference of 14 and 7 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 7.
14 – 7 = 7.
the difference of 14 and 7 = 7.

Lesson Check

Question 1.
Write an addition fact that helps you solve 12 – 4
_8_ + _4_ = _12_

Spiral Review

Question 2.
Circle the greater addend. Count on to find the sum.

The sum of 9 and  3 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 3.
9 + 3 = 12.
the sum of 9 and 3 = 12.

Question 3.
Draw to show the doubles fact. Write the sum.

The sum of 8 and  8 = 16.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 8.
8 + 8 = 16.
the sum of 8 and 8 = 16.

### Lesson 5.7 Choose an Operation

Essential Question
How do you choose when to add and when to subtract to solve a problem?

Listen and Draw

Listen to the problem. Use to solve. Draw a picture to show your work.

_3_ white balloons

Math Talk
MATHEMATICAL PRACTICES
How did you solve this problem? Explain.

Model and Draw

Mary sees 8 squirrels. Jack sees 9 more squirrels than Mary. How many squirrels does Jack see? Do you add or subtract to solve?

The number of squirrels does jack see = 17.

Explanation:
In the above-given question,
given that,
Mary sees 8 squirrels.
jack sees 9 more squirrels than mary.
8 + 9 = 13.
The number of squirrles does jack see = 17.

Share and Show MATH BOARD

Circle add or subtract. Write a number sentence to solve.

Question 1.
Hanna has 5 markers. Owen has 9 more markers than Hanna. How many markers does Owen have?

The number of markers does Owen has = 14.

Explanation:
In the above-given question,
given that,
Hanna has 5 markers.
Owen has 9 more markers than Hanna.
5 + 9 = 14.
The number of markers does Owen has = 14.

Question 2.
Angel has 13 apples. He gives some away. Then there were 5 apples. How many apples does he give away?

The number of apples he gives = 8.

Explanation:
In the above-given question,
given that,
Angel has 13 apples.
He gives some away.
Then there were 5 apples.
13 – 5 = 8.
The number of apples he gives = 8.

Question 3.
Deon has 18 blocks. He builds a house with 9 of the blocks. How many blocks does Deon have now?

The number of blocks does Deon has now = 9.

Explanation:
In the above-given question,
given that,
Deon has 18 blocks.
He builds a house with 9 of the blocks.
18 – 9 = 9.
The number of blocks Does has now = 9.

Circle add or subtract. Write a number sentence to solve.

Question 4.
Rob sees 5 raccoons. Talia sees 4 more raccoons than Rob. How many raccoons do they see?

______9______
__9__ raccoons

The number of raccoons they see = 9.

Explanation:
In the above-given question,
given that,
Rob sees 5 raccoons.
Talia sees 4 more raccoons than Rob.
5 + 4 = 9.
The number of raccoons they see = 9.

Question 5.
Eli has a box with 12 eggs. His other box has no eggs. How many eggs are in both boxes?

___12_________
_12___ eggs

The number of eggs in both the boxes = 12.

Explanation:
In the above-given question,
given that,
Eli has a box with 12 eggs.
His other box has no eggs.
12 + 0 = 12.
The number of eggs in both the boxes = 12.

Question 6.
Leah has a bowl with 16 fish. Some fish have long tails. 7 fish have short tails. How many fish have long tails?

__9__________
__9__ fish

The number of fish have long tails  = 9.

Explanation:
In the above-given question,
given that,
Leah has a bowl with 16 fish.
some fish have long tails.
16 – 7 = 9.
The number of fish have long tails = 9.

Question 7.
GO DEEPER Sasha has 8 red apples. She has 3 fewer green apples than red apples. How many apples does she have?

___13___
_13_ apples

The number of apples have = 13.

Explanation:
In the above-given question,
given that,
Sasha has 8 red apples.
she has 3 fewer green apples than red apples.
8 + 5 = 13.
The number of apples have = 13.

Problem Solving • Applications

MATHEMATICAL PRACTICE

Apply Choose a way to solve. Write or draw to explain.

Question 8.
James has 4 big markers and 7 skinny markers. How many markers does he have?

_11_ markers

The number of markers James has =  11.

Explanation:
In the above-given question,
given that,
James has 4 big markers and 7 skinny markers.
7 + 4 = 11.
The number of markers james has = 11.

Question 9.
Sam has 9 baseball cards. She wants to have 17 cards. How many more cards does she need?

_8_ more cards

The number of cards she needs more = 8.

Explanation:
In the above-given question,
given that,
Sam has 9 baseball cards.
she wants to have 17 cards.
The number of cards does she need = 8.

Question 10.
THINK SMARTER
Annie gets 15 pennies on Monday. She gets 1 more penny each day. How many pennies does she have on Friday?

_19_ pennies

The number of pennies does she have on Friday = 19.

Explanation:
In the above-given question,
given that,
Annie gets 15 pennies on Monday.
She gets 1 more penny each day.
15 + 4 = 19.
The number of pennies does she have on Friday = 19.

Question 11.
THINK SMARTER
Beth has 5 grapes. A friend gives her 8 grapes. How many grapes does Beth have now? Draw a picture to show your work.
Beth has _13_ grapes.

The number of grapes does Beth has now =13.

Explanation:
In the above-given question,
given that,
Beth has 5 grapes.
A friend gives her 8 grapes.
5 + 8 = 13.
The number of grapes does Beth has now =13.

TAKE HOME ACTIVITY
• Ask your child to write a number sentence that could be used to solve Exercise 9.

### Choose an Operation Homework & Practice 5.7

Circle add or subtract. Write a number sentence to solve.

Question 1.
Adam has a bag of 11 pretzels. He eats 2 of the pretzels. How many pretzels are left?

____13______
_13_ pretzels

The number of pretzels left = 13.

Explanation:
In the above-given question,
given that,
Adam has a bag of 11 pretzels.
He eats 2 of the pretzels.
11 + 2 = 13.
The number of pretzels left = 13.

Problem Solving

Choose a way to solve. Write or draw to explain.

Question 2.
Greg has 11 shirts. 3 have long sleeves. The rest have short sleeves. How many short-sleeve shirts does Greg have?
_8_ short-sleeve shirts

The number of short-sleeve does Greg has = 8.

Explanation:
In the above-given question,
given that,
Greg has 11 shirts. 3 have long sleeves.
The rest have short sleeves.
11 – 3 = 8.
The number of short-sleeves does Greg has = 8.

Question 3.
WRITE Math
Use words, numbers, or pictures to explain how a classmate solved a problem.

The number of short-sleeve does Greg has = 8.

Explanation:
In the above-given question,
given that,
Greg has 11 shirts. 3 have long sleeves.
The rest have short sleeves.
11 – 3 = 8.
The number of short-sleeves does Greg has = 8.

Lesson Check

Question 1.
Circle add or subtract. Write a number sentence to solve. There are 18 children on the bus. Then 9 children get off. How many children are left on the bus?

The number of children left on the bus = 9.

Explanation:
In the above-given question,
given that,
There are 18 children on the bus.
Then 9 children get off.
18 – 9 = 9.
The number of children left on the bus = 9.

Spiral Review

Question 2.
Choose a way to solve. Draw or write to explain. Mike has 13 plants. He gives some away. He has 4 left. How many plants does he give away?
_9_ plants

The number of plants does he give = 9.

Explanation:
In the above-given question,
given that,
Mike has 13 plants.
He gives some away. He has 4 left.
13 – 4 = 9.
The number of plants does he give = 9.

Go Math Grade 1 Chapter 5 Test Pdf Question 3.
Write the numbers 3, 2, and 8 in an addition sentence. Show two more ways to find the sum.
_3_ + _2_ + _8 = _13_
_5_ + _8_ = _13_
_8_ + _5_ = _13_

The sum of 5 and 8 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 8.
5 + 8 = 13.
the sum of 5 and 8 = 13.

The sum of 8 and 5 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 5.
8 + 5 = 13.
the sum of 8 and 5 = 13.

### Lesson 5.8 Algebra • Ways to Make Numbers to 20

Essential Question
How can you add and subtract in different ways to make the same number?

Listen and Draw

Use . Show two ways to make 10. Draw to show your work.

The sum of 5 and 5 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 5.
5 + 5 = 10.
the sum of 5 and 5 = 10.

The sum of 6 and 4 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 4.
6 + 4 = 10.
the sum of 6 and 4 = 10.

Math Talk
MATHEMATICAL PRACTICES
Use Tools How do your models show two ways to make 10?

Share and Show MATH BOARD

Use . Write ways to make the number at the top.

Question 1.

The sum of 8 and 5 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 5.
8 + 5 = 13.
the sum of 8 and 5 = 13.

Question 2.

The sum of 5 and 5 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 5.
5 + 5 = 10.
the sum of 5 and 5 = 10.

MATHEMATICAL PRACTICE
Use Appropriate Tools
Use . Write ways to make the number at the top.

Question 3.

The sum of 8 and 5  and 4= 17.

Explanation:
In the above-given question,
given that,
the numbers are 8, 5, and 4.
8 + 5 + 4 = 13.
the sum of 8,  4, and 5 = 17.

Question 4.

The sum of 4 and 7  and 3= 14.

Explanation:
In the above-given question,
given that,
the numbers are 4, 7, and 3.
4 + 7 + 3 = 14.
the sum of 4,  7, and 3 = 14.

Question 5.

The sum of 8 and 5  and 3= 16.

Explanation:
In the above-given question,
given that,
the numbers are 8, 5, and 3.
8 + 5 + 3 = 16.
the sum of 8,  5, and 3 = 16.

Question 6.

The sum of 8 and 5  and 4= 17.

Explanation:
In the above-given question,
given that,
the numbers are 8, 5, and 4.
8 + 5 + 4 = 17.
the sum of 8,  4, and 5 = 17.

THINK SMARTER
Choose a number less than 20. Write the number. Write two ways to make your number.

Question 7.

The sum of 10 and 10 = 20.

Explanation:
In the above-given question,
given that,
the numbers are 10 and 10.
10 + 10 = 20.
the sum of 10 and 10 = 20.

Question 8.

The sum of 8 and 12 = 20.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 12.
8 + 12 = 20.
the sum of 8 and 12 = 20.

Problem Solving • Applications

GO DEEPER
Write numbers to make each line have the same sum.

Question 9.

The number that have the same sum = 8.

Explanation:
In the above-given question,
given that,
the numbers are
3 + 8 + 6 = 17.
5 + 8 + 4 = 17.
17 – 9 = 8.
so the number = 8.

Question 10.

The number that have the same sum = 5.

Explanation:
In the above-given question,
given that,
the numbers are
3 + 6 + 6 = 15.
15 – 15 = 0.
15 – 10 = 5.
so the number = 5.

Question 11.
GO DEEPER
Choose a number from 14 to 20 to be the sum. Write numbers to make each line have your sum.
sum for each line ☐

The number that have the same sum = 16.

Explanation:
In the above-given question,
given that,
the numbers are
10 + 2 + 4 = 16
10 + 4 + 2 = 16.
10 + 1 + 5 = 16.
so the number = 16.

Question 12.
THINK SMARTER
Choose all the ways that make 13.

The sum of 10 and 3 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 10 and 3.
10 + 3 = 13.
the sum of 10 and 3 = 13.

TAKE HOME ACTIVITY
• Have your child explain three different ways to make 15. Encourage him or her to use addition and subtraction, including addition of three numbers.

### Algebra • Ways to Make Numbers to 20 Homework & practice 5.8

Use . Write ways to make the number at the top.

Question 1.

The number is 10.

Explanation:
In the above-given question,
given that,
2 + 7 + 1 = 10.
5 + 5 = 10.
10 – 0 = 10.
9 + 1 = 10.
the number is 10.

Question 2.

The number is 13.

Explanation:
In the above-given question,
given that,
8 + 3 + 2 = 13.
7 + 6 = 13.
13 – 0 = 13.
6 + 7 = 13.
the number is 13.

Problem Solving

Write numbers to make 3. each line have the same sum.

Question 3.

The number is 16.

Explanation:
In the above-given question,
given that,
5 + 7 + 4 = 16.
6 + 7 + 3 = 16.
7 + 2 + 7 = 16.
the number is 16.

Question 4.
WRITE Math
Use numbers and pictures to show two ways to make the number 12.
____6 + _6___=____12______
____5 ___+_7__=___12_____
___7__+__5___=__12______

The sum of 7 and 5 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 5.
7 + 5 = 12.
the sum of 7 and 5 = 12.

The sum of 8 and 4 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 4.
8 + 4 = 12.
the sum of 8 and 4 = 12.

Lesson Check

Question 1.
Write ways to make 18.

The number is 18.

Explanation:
In the above-given question,
given that,
9 + 8 + 1 = 18.
9 + 9 = 18.
18 – 0 = 18.
10 + 8 = 18
the number is 18.

Question 2.
Write ways to make 9.

The number is 9.

Explanation:
In the above-given question,
given that,
3 + 3 + 3 = 9.
6 + 3 = 9.
9 – 0 = 9.
8 + 1 = 9.
the number is 9.

Spiral Review

Question 3.
Write the doubles plus one fact for 7 + 7.
_7_ + _7_ = _14_

The sum of 7 and 7 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 7.
7 + 7 = 14.
the sum of 7 and 7 = 14.

Question 4.
Write the doubles minus one fact for 4 + 4.
_4_ + _4_ = _8_

The sum of 4 and 4 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 4.
4 + 4 = 8.
the sum of 4 and 4 = 8.

Question 5.

The sum of 9 and 5 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 5.
9 + 5 = 14.
the sum of 9 and 5 = 14.

The difference of 14 and 9 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 9.
14 – 9 = 5.
the difference of 14 and 9 = 5.

### Lesson 5.9 Algebra • Equal and Not Equal

Essential Question
How can you decide if a number sentence is true or false?

Listen and Draw

Color the cards that make the same number.

The cards that make the same number = 7.

Explanation:
In the above-given question,
given that,
the numbers that are the same.
6 + 1 = 7.
3 + 3 +1 = 7.
13 – 6 = 7.
3 + 4 = 7.
4 + 3 = 7.
3 + 2 + 2 = 7.
16 – 9 = 7.
the card that makes the same number = 7.

Math Talk
MATHEMATICAL PRACTICES

Reasoning Why can you use two of the cards you color and an equal sign to make a number sentence?

Model and Draw

The equal sign means that both sides are the same.
Write a number to make each true.

The number is 4 + 5 = 5 + 4.

Explanation:
In the above-given question,
given that,
9 = 9.
4 + 5 = 9.
4 + 5 = 5 + 4.
The number is 4 + 5 = 5 + 4.

Share and Show MATH BOARD

Question 1.

Question 2.
4 + 1 = 5 + 2
6 – 6 = 7 – 7

The number that is true is 6 – 6 = 7 – 7.

Explanation:
In the above-given question,
given that,
the numbers are 4 + 1 = 5.
5 + 2 = 7.
the number that  is true is 6 – 6 = 7 – 7.

Question 3.
7 + 2 = 6 + 3
8 – 2 = 6 + 4

The number that is true is 7 + 2 = 6 + 3.

Explanation:
In the above-given question,
given that,
the numbers are
8 – 2 = 6 + 4
the number that  is true is 7 + 2 = 6 + 3.

Question 4.
5 – 4 = 4 – 3
10 = 1 + 0

The number that is true is 5 – 4 = 4 – 3.

Explanation:
In the above-given question,
given that,
the numbers are 10 = 1 + 0.
the number that  is true is 5 – 4 = 4 -3.

MATHEMATICAL PRACTICE

Attend to Precision

Question 5.

The number that is true is 8 + 1 = 2 + 7, 19 = 19.

Explanation:
In the above-given question,
given that,
the numbers are 1 + 9 = 9  – 1.
the number that  is true is 8 + 1 = 2 + 7, 19 = 19.

Question 6.

The number that is true is 9 + 7 = 16.

Explanation:
In the above-given question,
given that,
the numbers are 16 – 9 = 9 + 7.
9 – 7 = 7 + 9.
the number that  is true is 9 + 7 = 16.

Question 7.
THINK SMARTER
Lyle writes the false number sentence 2 + 10 = 8. Complete the number sentence to make the sentence true.
2 + _6_ = 8

The number that is true is 2 + 6 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 2 + 10 = 8.
the number that  is true is 2 + 6 = 8.

Write numbers to make sentences that are true.

Question 8.
2 + 10 = 7 + _5_

The number that is true is 12 = 12.

Explanation:
In the above-given question,
given that,
the numbers are
2 + 10 = 7 + 5.
the number that is true is 12 = 12.

Question 9.
_9_ = 2 + 3 + 4

The number that is true is 9 = 9.

Explanation:
In the above-given question,
given that,
the numbers are
9 = 2 + 3 + 4.
the number that is true is 9 = 9..

Question 10.
0 + 9 = _0_ – 9

The number that is true is 9 = 9.

Explanation:
In the above-given question,
given that,
the numbers are
9 = 9
the number that is true is 9 = 9.

Question 11.
_6_ + 7 = 7 + 6

The number that is true is 13 = 13.

Explanation:
In the above-given question,
given that,
the numbers are
6 + 7 = 7 + 6.
the number that is true is 13 = 13.

Question 12.
THINK SMARTER
Write numbers to show expressions of equal value.
_6_ + _7_ = _7_ + _6_

The number that is true is 13 = 13.

Explanation:
In the above-given question,
given that,
the numbers are
6 + 7 = 7 + 6.
the number that is true is 13 = 13.

Problem Solving • Applications

Question 13.
Which are true? Use to color.

The number that is true is 20 = 20, 9 + 1 + 1 = 11.

Explanation:
In the above-given question,
given that,
the numbers are
20 = 20, 9 + 1 + 1 = 11, 8 – 0 = 8, 10 + 1 = 1 + 10, 6 = 2 + 2 + 2.
the number that is true is 20 = 20.

Question 14.
THINK SMARTER
Use the same numbers. Write a different number sentence that is true.
7 + 8 = 15

The difference of 15 and 7 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 7.
15 – 7 = 8.

Question 15.
THINK SMARTER
Is the math sentence true? Circle Yes or No.

The number that is true is 5 – 4 = 9 – 8, 6 + 2 = 2 + 6.

Explanation:
In the above-given question,
given that,
the numbers are
5 – 4 = 9 – 8, 13 = 5 + 7, 6 + 2 = 2 + 6.
the number that is true is 5 – 4 = 9 – 8, 6 + 2 = 2 + 6.

TAKE HOME ACTIVITY
• Write 10 = 7 − 3 and 10 = 7 + 3 on a sheet of paper. Ask your child to explain which is true.

### Algebra • Equal and Not Equal Homework & practice 5.9

Question 1.
6 + 4 = 5 + 5

The number is true.

Explanation:
In the above-given question,
given that,
the numbers are
6 + 4 = 5 + 5.
10 = 10.
The number that is true.

Question 2.
10 = 6 – 4

The number is false.

Explanation:
In the above-given question,
given that,
the numbers are
10 = 6 – 4.
10 = 2.
The number that is false.

Question 3.
8 + 8 = 16 – 8

The number is false.

Explanation:
In the above-given question,
given that,
the numbers are
8 + 8 = 16 – 8.
16 = 8.
The number that is false.

Question 4.
14 = 1 + 4

The number is false.

Explanation:
In the above-given question,
given that,
the numbers are
14 = 1 + 4 .
14 = 5.
The number is false.

Question 5.
8 – 0 = 12 – 4

The number is true.

Explanation:
In the above-given question,
given that,
the numbers are
8 – 0 = 12 – 4.
8 = 8.
The number is true.

Question 6.
17 = 9 + 8

The number is true.

Explanation:
In the above-given question,
given that,
the numbers are
17 = 9 + 8.
17 = 17.
The number is true.

Problem Solving

Question 7.
Which are true? Use a to color.

The number is true.

Explanation:
In the above-given question,
given that,
the numbers are
15 = 15, 3 = 8 – 5, 9 + 2 = 2 + 9, 1 + 2 + 3 = 3 + 3, 13 = 8 + 5.
The number is true.

Question 8.
WRITE Math
Write 5 + ☐ = 6 + 8. Write a number to make the sentence true. Draw a quick picture to explain.

___5 + 9_ = __14____________
____6 + 8 _=__14__________

The sum of 5 + 9 = 6 + 8.

Explanation:
In the above-given question,
given that,
5 + 9 = 14.
6 + 8 = 14.
14 = 14.
The sum is 14.

Lesson Check

Question 1.
Circle the number sentences that are true. Cross out the ones that are false.

The number is true.

Explanation:
In the above-given question,
given that,
the numbers are
4 + 3 = 9 – 2, 4 + 3 = 6 + 1.
The number is true.

Spiral Review

Question 2.
Use 5, 6 and 11 to write related addition and subtraction sentences.

The numbers are 5 + 6 = 11.
6 + 5 = 11.
11 – 6 = 5.
11 – 5 = 6.

Explanation:
In the above-given question,
given that,
the numbers are
5 + 6 = 11.
6 + 5 = 11.
11 – 6 = 5.
11 – 5 = 6.

Question 3.
Solve. Draw or write to show your work. Leah has 4 green toys, 5 pink toys, and 2 blue toys. How many toys does Leah have?
_11_ toys

The number of toys does Leah has = 11.

Explanation:
In the above-given question,
given that,
Leah has 4 green toys, 5 pink toys, and 2 blue toys.
4 + 5 + 2 = 11.
The number of toys does Leah has = 11.

### Lesson 5.10 Facts Practice to 20

Essential Question

Listen and Draw
What is 2 + 8?
Use . Draw to show a strategy you can use to solve.

2 + 8 = _10_

The sum of 2 and 8 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 2 and 8.
8 + 2 = 10.
the sum of 2 and 8 = 10.

Math Talk
MATHEMATICAL PRACTICES
Explain What other strategy could you use to solve the addition fact?

Share and Show MATH BOARD

Question 1.
2 + 5 = _7_

The sum of 2 and 5 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 2 and 5.
2 + 5 = 7.
the sum of 2 and 5 = 7.

Question 2.
9 – 6 = _3_

The difference of 9 and 6 = 3.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 6.
9 – 6 = 3.
the difference of 9 and 6 = 3.

Question 3.
_12_ = 9 + 3

The sum of 9 and 3 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 3.
9 + 3 = 12.
the sum of 9 and 3 = 12.

Question 4
15 – 7 = _8_

The difference of 15 and 7 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 7.
15 – 7 = 8.
the difference of 15 and 7 = 8.

Question 5.
3 – 1 = _2_

The difference of 3 and 1 = 2.

Explanation:
In the above-given question,
given that,
the numbers are 3 and 1.
3 – 1 = 2.
the difference of 3 and 1 = 2.

Question 6.
_8_ = 2 + 6

The sum of 2 and 6 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 2 and 6.
2 + 6 = 8.
the sum of 2 and 6 = 8.

Question 7.
2 + ☐ = 11

The sum of 2 and 9 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 2 and 9.
2 + 9 = 11.
the sum of 2 and 9 = 11.

Question 8.
10 – ☐ = 2

The difference of 10 and 8 = 2.

Explanation:
In the above-given question,
given that,
the numbers are 10 and 8.
10 – 8 = 2.
the difference of 10 and 8 = 2.

Question 9.
8 = 8 + ☐

The sum of 8 and 0 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 0.
8 + 0 = 8.
the sum of 8 and 0 = 8.

Question 10.
12 – 9 = _3_

The difference of 12 and 9 = 3.

Explanation:
In the above-given question,
given that,
the numbers are 12 and 9.
12 – 9 = 3.
the difference of 12 and 9 = 3.

Question 11.
12 – 4 = _8_

The difference of 12 and 4 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 12 and 4.
12 – 4 = 8.
the difference of 12 and 4 = 8.

Question 12.
_13_ = 4 + 9

The sum of 9 and 4 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 4.
9 + 4 = 13.
the sum of 9 and 4 = 13.

Question 13.
☐ + 8 = 13

The sum of 8 and 5 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 5.
8 + 5 = 13.
the sum of 8 and 5 = 13.

Question 14.
☐ – 1 = 6

The difference of 7 and 1 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 1.
7 – 1 = 6.
the difference of 7 and 1 = 6.

Question 15.
9 = ☐ + 3

The sum of 6 and 3 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 3.
6 + 3 = 9.
the sum of 6 and 3 = 9.

Question 16.
16 – 7 = _9_

The difference of 16 and 7 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 16 and 7.
16 – 7 = 9.
the difference of 16 and 7 = 9.

Question 17.
11 – 8 = _3_

The difference of 11 and 8 = 3.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 8.
11 – 8 = 3.
the difference of 11 and 8 = 3.

Question 18.
_15_ = 8 + 7

The sum of 8 and 7 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 7.
8 + 7 = 15.
the sum of 8 and 7 = 15.

MATHEMATICAL PRACTICE
Attend to Precision

Question 19.

The sum of 6 and 0 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 0.
6 + 0 = 6.
the sum of 6 and 0 = 6.

Question 20.

The difference of 17 and 8 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 8.
17 – 8 = 9.
the difference of 17 and 8 = 9.

Question 21.

The sum of 4 and 7 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 7.
4 + 7 = 11.
the sum of 4 and 7 = 11.

Question 22.

The difference of 9 and 0 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 0.
9 – 0 = 9.
the difference of 9 and 0 = 9.

Question 23.

The difference of 17 and 9 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 9.
17 – 9 = 8.
the difference of 11 and 8 = 3.

Question 24.

The sum of 4 and 6 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 6.
4 + 6 = 10.
the sum of 4 and 6 = 10.

Question 25.

The sum of 3 and 7 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 3 and 7.
3 + 7 = 10.
the sum of 3 and 7 = 10.

Question 26.

The difference of 8 and 5 = 3.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 5.
8 – 5 = 3.
the difference of 8 and 5 = 3.

Question 27.

The sum of 8 and 3 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 3.
8 + 3 = 11.
the sum of 8 and 3 = 11.

Question 28.

The difference of 8 and 6 = 2.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 6.
8 – 6 = 2.
the difference of 8 and 6 = 2.

Question 29.

The difference of 10 and 4 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 10 and 4.
10 – 4 = 6.
the difference of 10 and 4 = 6.

Question 30.

The sum of 9 and 8 = 17.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 8.
9 + 8 = 17.
the sum of 8 and 9 = 17.

Question 31.

The sum of 6 and 7 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 7.
6 + 7 = 13.
the sum of 6 and 7 = 13.

Question 32.

The difference of 4 and 4 = 0.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 4.
4 – 4 = 0.
the difference of 4 and 4 = 0.

Question 33.

The sum of 5 and 6 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 6.
5 + 6 = 11.
the sum of 5 and 6 = 11.

Question 34.

The difference of 13 and 6 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 6.
13 – 6 = 7.
the difference of 13 and 6 = 7.

Question 35.

The difference of 17 and 9 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 9.
17 – 9 = 8.
the difference of 17 and 9 = 8.

Question 36.

The sum of 8 and 8 = 16.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 8.
8 + 8 = 16.
the sum of 8 and 8 = 16.

Question 37.

The sum of 10 and 5 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 10 and 5.
10 + 5 = 15.
the sum of 10 and 5 = 15.

Question 38.

The difference of 13 and 3 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 3.
13 – 3 = 10.
the difference of 13 and 3 = 10.

Question 39.

The sum of 10 and 3 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 10 and 3.
10 + 3 = 13.
the sum of 10 and 3 = 13.

Question 40.

The difference of 20 and 10 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 20 and 10.
20 – 10 = 10.
the difference of 20 and 10 = 10.

Question 41.

The difference of 10 and 9 = 1.

Explanation:
In the above-given question,
given that,
the numbers are 10 and 9.
10 – 9 = 1.
the difference of 10 and 9 = 1.

Question 42.

The sum of 9 and 10 = 19.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 10.
9 + 10 = 19.
the sum of 9 and 10 = 19.

Question 43.
Use the clues to write the addition fact. The sum is 14. One addend is 2 more than the other.

The sum of 6 and 8 = 14.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 8.
6 + 8 = 14.
the sum of 6 and 8 = 14.

Problem Solving • Applications

Solve. Write or draw to explain.

Question 44.
There are 14 rabbits. Then 7 rabbits hop away. How many rabbits are there now?
_7_ rabbits

The number of rabbits now = 7.

Explanation:
In the above-given question,
given that,
There are 14 rabbits.
Then 7 rabbits hop away.
14 – 7 = 7.
The number of rabbits now = 7.

Question 45.
There are 11 dogs at the park. 2 dogs are gray. The rest are brown. How many dogs are brown?
__9 brown dogs

The number of brown dogs = 9.

Explanation:
In the above-given question,
given that,
There are 11 dogs at the park.
2 dogs are gray.
11 – 2 = 9.
The number of brown dogs = 9.

Question 46.
GO DEEPER
Fill in the blanks. Write the addition fact. Solve. There are __ ladybugs on a leaf. Then __ more ladybugs come. How many ladybugs are there now?

The number of ladybugs now = 8.

Explanation:
In the above-given question,
given that,
There are 6 ladybugs on a leaf.
6 + 2 = 8.
The number of ladybugs now = 8.

Question 47.
THINK SMARTER
Marco has 13 marbles. Lucy has 8 marbles. How many more marbles does Marco have than Lucy? Write or draw to show your work.
_5_ more marbles

The number of marbles Marco has = 5.

Explanation:
In the above-given question,
given that,
Marco has 13 marbles.
Lucy has 8 marbles.
13 – 8 = 5.
The number of marbles Marco has = 5.

TAKE HOME ACTIVITY
• Have your child draw a picture to solve 7 + 4. Then have him or her tell a related subtraction fact.

### Facts Practice to 20 Homework & Practice 5.10

Question 1.

The sum of 9 and 4 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 4.
9 + 4 = 13.
the sum of 9 and 4 = 13.

Question 2.

The difference of 13 and 6 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 6.
13 – 6 = 7.
the difference of 13 and 6 = 7.

Question 3.

The sum of 4 and 5 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 4 and 5.
4 + 5 = 9.
the sum of 4 and 5 = 9.

Question 4.

The sum of 7 and 8 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 8.
7 + 8 = 15.
the sum of 7 and 8 = 15.

Question 5.

The difference of 11 and 6 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 11 and 6.
11 – 6 = 5.
the difference of 11 and 6 = 5.

Question 6.

The difference of 17 and 8 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 17 and 8.
17 – 8 = 9.
the difference of 17 and 8 = 9.

Question 7.

The sum of 5 and 7 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 7.
5 + 7 = 12.
the sum of 5 and 7 = 12.

Question 8.

The difference of 13 and 5 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 13 and 5.
13 – 5 = 8.
the difference of 13 and 5 = 8.

Question 9.

The difference of 16 and 9 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 16 and 9.
16 – 9 = 7.
the difference of 16 and 9 = 7.

Question 10.

The sum of 3 and 8 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 3 and 8.
3 + 8 = 11.
the sum of 3 and 8 = 11.

Question 11.

The difference of 9 and 8 = 1.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 8.
9 – 8 = 1.
the difference of 9 and 8 = 1.

Question 12.

The sum of 7 and 6 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 7.
6 + 7 = 13.
the sum of 6 and 7 = 13.

Question 13.

The difference of 9 and 2 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 9 and 2.
9 – 2 = 7.
the difference of 9 and 2 = 7.

Question 14.

The sum of 6 and 4 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 4.
6 + 4 = 10.
the sum of 6 and 4 = 10.

Question 15.

The difference of 8 and 5 = 3.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 5.
8 – 5 = 3.
the difference of 8 and 5 = 3.

Question 16.

The sum of 6 and 6 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 6.
6 + 6 = 12.
the sum of 6 and 6 = 12.

Question 17.

The sum of 0 and 9 = 9.

Explanation:
In the above-given question,
given that,
the numbers are 0 and 9.
0 + 9 = 9.
the sum of 0 and 9 = 9.

Question 18.

The difference of 15 and 9 = 6.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 9.
15 – 9 = 6.
the difference of 15 and 9 = 6.

Problem Solving

Solve. Draw or write to explain.

Question 19.
Kara has 9 drawings. She gives 4 away. How many drawings does Kara have now?
_5_ drawings

The number of drawings kara has = 5.

Explanation:
In the above-given question,
given that,
Kara has 9 drawings.
she gives 4 away.
9 – 4 = 5.
The number of drawings kara has = 5.

Question 20.
WRITE Math
Choose two numbers from 5 to 9. Use your numbers to write an addition sentence. Draw a picture to show your work.
__________________

The sum of 6 and 6 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 6.
6 + 6 = 12.
the sum of 6 and 6 = 12.

Lesson Check

Question 1.

The sum of 8 and 7 = 15.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 7.
8 + 7 = 15.
the sum of 8 and 7 = 15.

The sum of 5 and 8 = 13.

Explanation:
In the above-given question,
given that,
the numbers are 5 and 8.
5 + 8 = 13.
the sum of 5 and 8 = 13.

The difference of 14 and 7 = 7.

Explanation:
In the above-given question,
given that,
the numbers are 14 and 7.
14 – 7 = 7.
the difference of 14 and 7 = 7.

The difference of 15 and 6 = 8.

Explanation:
In the above-given question,
given that,
the numbers are 15 and 6.
15 – 6 = 8.
the difference of 15 and 6 = 8.

Spiral Review

Question 2.
What is the missing number? Write the missing addend.
7 + ☐ = 12

The sum of 7 and 5 = 12.

Explanation:
In the above-given question,
given that,
the numbers are 7 and 5.
7 + 5 = 12.
the sum of 5 and 7 = 12.

Question 3.
Greg knows 7 + 4 = 11. What other addition fact does he know that shows the same addends? Write the new fact.
_6_ + _5_ = _11_

The sum of 6 and 5 = 11.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 5.
6 + 5 = 11.
the sum of 6 and 5 = 11.

### Addition and Subtraction Relationships Chapter 5 Review/Test

Question 1.
There are 2 dogs in the park. Some more dogs come. Now there are 9 in all. How many dogs come?

2 dogs __ come 9 dogs in all

The number of dogs comes = 7.

Explanation:
In the above-given question,
given that,
There are 2 dogs in the park.
some more dogs come.
Now there are 9 in all.
2 + 7 = 9.
The number of dogs comes = 7.

Question 2.
Which fact is a related fact?

The difference of 8 and 3 = 5.

Explanation:
In the above-given question,
given that,
the numbers are 8 and 3.
8 – 3 = 5.
the difference of 8 and 3 = 5.

Question 3.
Look at the facts. Are they related facts? Choose Yes or No.

Yes, the number is a related fact.

Explanation:
In the above-given question,
given that,
the numbers are 14 – 6 = 8.
8 + 6 = 14.
the number is a related fact.

Question 4.
Tom sees 12 bees. Then 7 bees fly away. How many bees does he see now? Write a number sentence to solve. Then write an addition sentence to check.

The number of bees now = 5.

Explanation:
In the above-given question,
given that,
Tom sees 12 bees.
Then 7 bees fly away.
12 – 7 = 5.
The number of bees now = 5.

Question 5.
THINK SMARTER
Use to find the unknown numbers. Write the numbers.

6 + _10_ = 16
16 – 6 = _10_

The sum of 6 and 10 = 16.

Explanation:
In the above-given question,
given that,
the numbers are 6 and 10.
6 + 10 = 16.
the sum of 6 and 10 = 16.

The difference of 16 and 6 = 10.

Explanation:
In the above-given question,
given that,
the numbers are 16 and 6.
16 – 6 = 10.
the difference of 16 and 6 = 10.

Question 6.
Which is the unknown number in these related facts?

The unknown number = 9.

Explanation:
In the above-given question,
given that,
the numbers are 9 + 4 = 13.
13 – 4 = 9.
4 + 9 = 13.
13 – 9 = 4.
so the unknown number is 9.

Question 7.
Joe has 7 blue marbles. A friend gives him 6 red marbles. How many marbles does Joe have now? Draw a picture to show your work.
Joe has _13_ marbles.

The number of marbles Joe has = 13.

Explanation:
In the above-given question,
given that,
Joe has 7 blue marbles.
A friend gives him 6 red marbles.
7 + 6 = 13.
The number of marbles Joe has = 13.

Question 8.
Choose all the ways that make 12.

The numbers are = 4 + 8 and 5 + 5 + 2.

Explanation:
In the above-given question,
given that,
the numbers are
4 + 8 = 12.
5 + 5 + 5 = 12.
The numbers are = 4 + 8 and 5 + 5 + 2.

Question 9.
Is the math sentence true? Choose Yes or No.

The numbers are true = 9 = 6 + 3.

Explanation:
In the above-given question,
given that,
The sentences are 7 + 2 = 9 -2.
9 = 6 + 3.
5 + 4 = 4 + 5.
The numbers are true = 9 = 6 + 3.

Question 10.
Ann has 14 white socks. Bill has 6 white socks. How many more white socks does Ann have than Bill? Write or draw to show your work.

_8_ more white socks

The number of socks does Ann has than Bill = 8.

Explanation:
In the above-given question,
given that,
Ann has 14 white socks.
Bill has 6 white socks.
The number of socks does Ann has than Bill = 8.

Question 11.
GO DEEPER Alma has 5 crayons. Her dad gives her 7 more crayons. How many crayons does she have now? Use a related fact to
Alma has _12_ crayons.
Write a related fact to check.
_12_ − _7_ = 5

The number of crayons Alma has = 12.

Explanation:
In the above-given question,
given that,
Alma has 5 crayons.
Her dad gives her 7 more crayons.
5 + 7 = 12.
The number of crayons Alma has = 12.

Question 12.
Julia buys 12 books. She gives 9 books away. How many books does she have left?

_3_ books left

The number of books Julia has left = 3.

Explanation:
In the above-given question,
given that,