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 13.5 Answer Key Use Related Facts.

## Texas Go Math Grade 1 Lesson 13.5 Answer Key Use Related Facts

**Explore**

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

8 + ________ = 10

Answer:

Add 2 to number 8 to get 10

FOR THE TEACHER • Read the following problem. Dean has number cards for 8 and 10. What number card would Dean need to add to 8 to get 10?

Answer:

Dean has number cards for 8 and 10.

The number card 2 is needed to Dean to add to 8 to get 10.

**Math Talk**

**Mathematical Processes**

Describe how to solve this problem cubes.

Answer:

**Model and Draw**

You can use an addition fact to find a related subtraction fact.

Find 10 – 3

3 + _______ = 10

10 – 3 = _________

I know that 3 + 7 = 10, So 10 – 3 = 7.

Answer:

The unknown number is 7.

**Share and Show**

**Write the unknown numbers.**

Question 1.

Find 14 – 8

8 + ________ = 14

14 – 8 = _________

Answer:

The unknown number is 6.

Question 2.

Find 17 – 8.

8 + ___________ = 17

17 – 8 = _________

Answer:

The know number is 9.

Question 3.

Find 11 – 6.

6 + _________ = 11

11 – 6 = __________

Answer:

The unknown number is 5.

Question 4.

Find 15 – 9.

9 + __________ = 15

15 – 9 = __________

Answer:

The unknown number is 6.

**Problem Solving**

**Write the unknown numbers.**

Question 5.

Find 20 – 10

10 + _________ = 20

20 – 10 = __________

Answer:

The unknown number is 10.

Question 6.

Find 13 – 4.

4 + _________ = 13

13 – 4 = _________

Answer:

The unknown number is 9.

Question 7.

**H.O.T.**

Answer:

**H.O.T. Multi-Step** Write an addition sentence to help you find the difference. Then write the related subtraction sentence to solve.

Question 8.

Find 11 – 5.

________ + ________ = _________

________ – _________ = _________

Answer:

5 + 6 = 11

11 – 5 = 6

Question 9.

Find 13 – 6.

_________ = ________ + _________

_________ = ________ + _________

Answer:

13 = 7 + 6

7 = 13 – 6

**Daily Assessment Task**

**Choose the correct answer.**

Question 10.

15 baby bears brush their teeth before going to bed. 8 baby bears still need to brush their teeth. How many baby bears have already brushed their teeth?

15 – 8 = _________

8 + _________ = 15

(A) 7

(B) 6

(C) 1

Answer:

Given that,

Baby bears brush their teeth before going to bed = 15.

Baby bears still need to brush their teeth = 8

Baby bears have already brushed their teeth = 15 – 8 = 7

Option A is correct.

Question 11.

Analyze Hanna has II baseball cards. She gives 5 away. She wants to know how many are left. Which number sentence will help you find the missing number?

(A) 11 + 5 = 16

(B) 5 + 6 = 11

(C) 6 – 5 = 1

Answer:

Given that

The total number of baseballs near Hanna = 11

The total number of baseballs away from Hanna = 5

Number of baseballs left = 11 – 5 =6

5 + 6 = 11number sentence will help to find the missing number

Question 12.

John has 10 books. He reads some books. He has 6 books left to read. Which shows the unknown number of books John has read?

(A) 10 – _________ = 6

(B) 10 – _________ = 2

(C) 4 + _________ = 8

Answer:

John has books to read = 10

He has books left to read = 6

10 – 6 = 4

4 number of books are read by John.

10 – 4 = 6 expression is correct.

Question 13.

**TEXAS Test Prep** Which addition fact helps you solve 17 – 8?

(A) 8 + 7 = 15

(B) 9 + 8 = 17

(C) 9 + 9 = 18

Answer:

9 + 8 = 17 equation helps to solve the 17 – 8

9 + 8 = 17

9 = 17 – 8

**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.

Answer:

Your child has small objects such as paper clips = 5.

How many objects does he need to get 12 objects are 12 – 5 = 7

7 objects are needed to have 12 objects.

### Texas Go Math Grade 1 Lesson 13.5 Homework and Practice Answer Key

**Write the unknown numbers.**

Question 1.

Find 16 – 7.

7 + ________ = 16

16 – 7 = ___________

Answer:

The unknown number is 9.

Question 2.

Find 12 – 5

5 + __________ = 12

12 – 5 = ___________

Answer:

The unknown number is 7.

Question 3.

Find 14 – 6

6 + ________ = 14

14 – 6 = __________

Answer:

The unknown number is 8.

Question 4.

Find 13 – 8

8 + __________ = 13

13 – 8 = ___________

Answer:

The unknown number is 5.

**Problem Solving**

**Multi-Step** Write an addition sentence to help you find the difference. Then write the related subtraction sentence to solve.

Question 5.

Find 17 – 9

________ + ________ = __________

________ – ________ = __________

Answer:

9 + 8 = 17

17 – 9 = 8

Question 6.

Find 15 – 6

__________ = __________ + _________

__________ = __________ – _________

Answer:

15 = 9 + 6

9 = 15 – 6

**Lesson Check**

**Choose the correct answer.**

Question 7.

Tina washes 16 dishes after dinner. She still needs to wash 9 of the dishes. How many dishes has Tina already washed?

16 – 9 = _____________

9 + __________ = 16

(A) 7

(B) 9

(C) 8

Answer:

Tina washes 16 dishes after dinner.

she still has 9 dishes to wash.

Tina already washed = 16 – 9 = 7

A is the correct option

Question 8.

Nate has 12 model planes. He paints some planes. He has 5 pIanes left to paint. Which shows how many planes Nate has left to paint?

(A) 12 – ________ = 8

(B) 5 + ________ = 7

(C) 12 – ________ = 5

Answer:

Nate has 12 model planes.

She paints some plans and 5 planes are left to paint.

Planes paint to left = 12 – 5 = 7

Question 9.

Which addition fact helps you solve 15 – 7?

(A) 7 + 9 = 16

(B) 7 + 8 = 15

(C) 6 + 9 = 15

Answer:

7 + 8 = 15 helps to solve the 15 – 7.

From the above equation

15 – 7 = 8.

Question 10.

Mark wants to find 13 – 5. Which shows the related subtraction sentence?

(A) 13 – 8 = 5

(B) 13 – 9 = 4

(C) 13 – 6 = 7

Answer:

13 – 5 related subtraction sentance is

13 – 8 = 5