Refer to our Texas Go Math Grade 1 Answer Key Pdf to score good marks in the exams. Test yourself by practicing the problems from Texas Go Math Grade 1 Lesson 8.1 Answer Key Choose an Operation.

## Texas Go Math Grade 1 Lesson 8.1 Answer Key Choose an Operation

**Essential Question**

How con you choose when to add and when to subtract to solve a problem?

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

___ math games

**For The Teacher**

- Read the following problem. Kira has 16 computer games. There are 8 adventure games. The rest are math games. How many math games does Kira have?

Explanation:

16 – 8 = 8

Kira has 8 math games.

Math Talk

**Mathematical Processes**

How did you solve this problem? Explain your strategy.

Explanation:

Kira has 16 computer games. There are 8 adventure games. The rest are math games.

16 – 8 = 8

8 math games that Kira have

**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?

Explain how you chose a strategy to solve the problem.

Answer:

Explanation:

8 + 9 = 17 squirrels that jack see

**Share and Show**

**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?

Answer:

Explanation:

Hanna has 5 markers. Owen has 9 more markers than Hanna.

5 + 9 = 14

Owen has 14 markers now.

Question 2.

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

Answer:

Explanation:

Angel has 13 apples. He gives some away. Then there were 5 apples.

13 – 5 = 8

he gave away 8 apples.

Question 3.

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

Answer:

Explanation:

Deon has 18 blocks. He builds a house with 9 of the blocks.

18 – 9 = 9

Deon has 9 blocks now.

**Problem Solving**

**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?

Answer:

Explanation:

Rob sees 5 raccoons. Talia sees 4 more raccoons than Rob.

5 + 4 = 9

They see 9 raccoons.

**Write or draw to solve.**

Question 5.

James has 4 big markers and 7 small markers. How many markers does he have?

Answer:

Explanation:

James has 4 big markers and 7 small markers.

4 + 7 = 11

they have 11 markers in all

Question 6.

**H.O.T.** Sam has 9 baseball cards. She gets one card from Mom. She wants to have 17 cards. How many more cards does she need?

Answer:

Explanation:

Sam has 9 baseball cards. She gets one card from Mom.

9 + 1 = 10

She wants to have 17 cards.

17 – 10 = 7

she need 7 more cards

Question 7.

**H.O.T. Multi-Step** Annie gets 15 pennies on Monday. She gets 1 more each day. How many pennies does she have on Friday?

Answer:

Explanation:

15 + 5 = 20

Monday to Friday there are 5 days

she has 20 on Friday

**Daily Assessment Task**

**Choose the correct answer.**

Question 8.

**Use Tools** A tree has 9 trunks. 5 trunks are large. The rest are small. Which number sentence shows how many trunks are small?

(A) 5 – 4 = 1

(B) 9 – 5 = 4

(C) 9 + 5 = 14

Answer: B

Explanation:

A tree has 9 trunks. 5 trunks are large.

9 – 5 = 4

4 trunks are small.

Question 9.

Morgan bought 8 lemons. She gave 3 lemons to her friends. Which number sentence shows how many lemons Morgan has now?

(A) 8 + 3 = 11

(B) 3 – 3 = 0

(C) 8 – 3 = 5

Answer: C

Explanation:

Morgan bought 8 lemons. She gave 3 lemons to her friends.

8 – 3 = 5

Morgan has 5 lemons now.

Question 10.

**Multi-Step** Jared has 7 toy trains. He gets 4 more from his mother. Then he gives 3 toy trains to his brother. How many toy trains does Jared have now?

(A) 8

(B) 11

(C) 4

Answer: A

Explanation:

Jared has 7 toy trains. He gets 4 more from his mother.

7 + 4 = 11

Then he gives 3 toy trains to his brother.

11 – 3 = 8

Jared has 8 toys now

Question 11.

**Texas Test Prep** There are 15 kittens. 6 are black. The rest are white. Which shows how many white kittens there are?

(A) 15 – 6 = 9

(B) 10 + 5 = 15

(C) 9 – 6 = 3

Answer: A

Explanation:

There are 15 kittens. 6 are black. The rest are white.

15 – 6 = 9

so, 9 cats are white

**Take Home Activity**

- Ask your child o write a number sentence that could be used to solve the following problem: Eli has a box with 12 eggs. His other box has no eggs. How many eggs are in both boxes?

Explanation:

12 + 0 = 12

In both the boxes combined had 12 eggs.

### Texas Go Math Grade 1 Lesson 8.1 Homework and Practice Answer Key

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

Question 1.

Kara has 17 books. Sam has 8 fewer books than Kara. How many books does Sam have?

Answer:

Explanation:

Kara has 17 books. Sam has 8 fewer books than Kara.

17 – 8 = 9

Sam has 9 books now

Question 2.

Devon buys 6 books. Sean buys 3 more than Devon. How many books do they buy?

Answer:

Explanation:

Devon buys 6 books. Sean buys 3 more than Devon.

6 + 3 = 9

9 + 6 = 15

**Problem Solving**

**Write or draw to solve.**

Question 3.

**Multi-Step** Isabella needs 16 muffins. She makes 9 banana muffins. Lucas gives her 2 more. How many more muffins does she need? Explain the strategy you used to solve the problem.

___ more muffins

Answer: 5 more muffins

Explanation:

9 + 2 = 11

16 – 11= 5

**Texas Test Prep**

**Lesson Check**

**Choose the correct answer.**

Question 4.

Zoe has 6 toy cars. Gabe has 9 more toy cars than Zoe. Which number sentence matches the picture?

(A) 6 + 3 = 9

(B) 9 – 6 = 3

(C) 6 + 9 = 15

Explain the strategy you used to solve the problem.

Answer: C

Explanation:

Zoe has 6 toy cars. Gabe has 9 more toy cars than Zoe.

6 + 9 = 15 matches the picture.

Question 5.

There are 13 animals. 5 are dogs. The rest are cats. Which number sentence matches the picture?

Explain the strategy you used to solve the problem.

Answer: 13 – 5 = 8

Explanation:

13 – 5 = 8

There are 8 cats

Question 6.

**Multi-Step** Katie has 5 small balls. She buys 9 more. Then she gives 6 to her friend. How many small balls does Katie have now?

(A) 8

(B) 14

(C) 9

Answer: A

Explanation:

Katie has 5 small balls. She buys 9 more.

5 + 9 = 14

Then she gives 6 to her friend.

14 – 6 = 8

Katie have 8 balls now