All the solutions provided in **McGraw Hill My Math Grade 1 Answer Key PDF Chapter 4 Lesson 6 Use Related Facts to Add and Subtract **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 1 Answer Key Chapter 4 Lesson 6 Use Related Facts to Add and Subtract

**Explore and Explain**

**Teacher Directions:** Use to model. There are 6 players on one side of the net and 8 players on the other side. How many people are playing volleyball in all? Write the addition number sentence. Then write a related subtraction fact.

Answer:

Explanation:

There are 6 players on one side of the net and 8 players on the other side

6 + 8 = 14

So, 14 people are playing football in all

The addition number sentence is 6 + 8 = 14

The related subtraction sentence is 14 – 8 = 6.

**See and Show**

Related facts use the same numbers.

These facts can help you add and subtract.

Find 11 – 5.

**Helpful Hint**

Use 6 + 5 = 11 to find 11 – 5 = 6

**Use related facts to add and subtract.**

Question 1.

7 + 9 = ___

16 – 7 = ____

Answer:

7 + 9 = 16

16 – 7 = 9

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

7 + 9 = 16

Use related fact to solve

So, 16 – 7 = 9.

Question 2.

5 + 8 = ___

13 – 5 = ___

Answer:

5 + 8 = 13

13 – 5 = 8

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

5 + 8 = 13

Use related fact to solve

So, 13 – 5 = 8.

Question 3.

Answer:

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

5 + 7 = 12

Use related fact to solve

So, 12 – 5 = 7.

Question 4.

Answer:

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

8 + 7 = 15

Use related fact to solve

So, 15 – 7 = 8.

**Talk Math**

Are the facts 1 + 5 = 6 and 6 – 1 = 5 related facts? How do you know?

Answer:

1 + 5 = 6 and 6 – 1 = 5 are related facts as they have same numbers.

**On My Own**

**Use related facts to add and subtract.**

Question 5.

9 + 6 = ____

15 – 9 = ____

Answer:

9 + 6 = 15

15 – 9 = 6

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

9 + 6 = 15

Use related fact to solve

So, 15 – 9 = 6.

Question 6.

6 + 7 = ___

13 – 6 = ___

Answer:

6 + 7 = 13

13 – 6 = 7

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

6 + 7 = 13

Use related fact to solve

So,13 – 6 = 7.

Question 7.

3 + 9 = ____

12 – 3 = ____

Answer:

3 + 9 = 12

12 – 3 = 9

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

3 + 9 = 12

Use related fact to solve

So, 12 – 3 = 9.

Question 8.

8 + 9 = ___

17 – 8 = ____

Answer:

8 + 9 = 17

17 – 8 = 9

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

8 + 9 = 17

Use related fact to solve

So, 17 – 8 = 9.

Question 19.

Answer:

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

7 + 9 = 16

Use related fact to solve

So, 14 – 6 = 8.

Question 20.

Answer:

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

8 + 4 = 12

Use related fact to solve

So, 12 – 4 = 8.

**Subtract. Write an addition fact to check your subtraction.**

Question 11.

16 – 9 = ____

____ + ____ = ____

Answer:

16 – 9 = 7

9 + 7 = 16

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

16 – 9 = 7

Use related fact to solve

So, 9 + 7 = 16.

Question 12.

12 – 7 = ____

____ + ____ = ____

Answer:

12 – 7 = 5

7 + 5 = 12

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

12 – 7 = 5

Use related fact to solve

So, 7 + 5 = 12.

Question 13.

14 – 9 = ____

____ + ____ = ____

Answer:

14 – 9 = 5

9 + 5 = 14

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

14 – 9 = 5

Use related fact to solve

So, 9 + 5 = 14.

Question 14.

11 – 4 = ____

____ + ____ = ____

Answer:

11 – 4 = 7

4 + 7 = 11

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

11 – 4 = 7

Use related fact to solve

So, 4 + 7 = 11.

**Problem Solving**

**Write a subtraction number sentence. Then write a related addition fact.**

Question 15.

Bailey sees 15 birds sitting on a rock. 7 of the birds fly away. How many of the birds are still on the rock?

____ – ____ = ____ ____ + ____ = ____

Answer:

15 – 7 = 8

8 + 7 = 15

Explanation:

Bailey sees 15 birds sitting on a rock

7 of the birds fly away

Related facts use the same numbers

These facts can help you add and subtract

15 – 7 = 8

Use related fact to solve

So, 8 + 7 = 15

Therefore, 8 birds are still on the rock.

Question 16.

Andre collects 10 shells. He loses 6 of them. How many shells does Andre have left?

____ – ____ = ____ ____ + ____ = ____

Answer:

10 – 6 = 4

6 + 4 = 10

Explanation:

Andre collects 10 shells

He loses 6 of them

Related facts use the same numbers

These facts can help you add and subtract

10 – 6 = 4

Use related fact to solve

So, 6 + 4 = 10

Therefore, Andre have left with 4 shells.

**Write Math** How can related facts help you add and subtract? Explain.

_____________________________

_____________________________

_____________________________

_____________________________

Answer:

Related facts an addition fact and subtraction fact that uses the same numbers addition something added to what you already have subtraction act of taking something away fact family a set of related addition/subtraction or multiplication/division equations that use the same numbers.

### McGraw Hill My Math Grade 1 Chapter 4 Lesson 6 My Homework Answer Key

**Practice**

**Use related facts to add and subtract.**

Question 1.

5 + 9 = ____

14 – 5 = ____

Answer:

5 + 9 = 14

14 – 5 = 9

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

5 + 9 = 14

Use related fact to solve

So, 14 – 5 = 9.

Question 2.

9 + 5 = ___

14 – 9 = ___

Answer:

9 + 5 = 14

14 – 9 = 5

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

9 + 5 = 14

Use related fact to solve

So, 14 – 9 = 5.

Question 3.

6 + 5 = ____

11 – 6 = ___

Answer:

6 + 5 = 11

11 – 6 = 5

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

6 + 5 = 11

Use related fact to solve

So, 11 – 6 = 5.

Question 4.

9 + 9 = ___

18 – 9 = ___

Answer:

9 + 9 = 18

18 – 9 = 9

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

9 + 9 = 18

Use related fact to solve

So, 18 – 9 = 9.

Question 5.

Answer:

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

8 + 8 = 16

Use related fact to solve

So, 16 – 8 = 8.

Question 6.

Answer:

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

8 + 3 = 13

Use related fact to solve

So, 13 – 8 = 5.

**Subtract. Write an addition fact to check your subtraction.**

Question 7.

15 – 8 = ___

____ + ____ = ____

Answer:

15 – 8 = 7

8 + 7 = 15

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

15 – 8 = 7

Use related fact to solve

So, 8 + 7 = 15.

Question 8.

17 – 9 = ____

____ + ____ = ____

Answer:

17 – 9 = 8

9 + 8 = 17

Explanation:

Related facts use the same numbers

These facts can help you add and subtract

17 – 9 = 8

Use related fact to solve

So, 9 + 8 = 17.

**Write a subtraction number sentence. Then write a related addition fact.**

Question 9.

There are 16 lobsters swimming together. 7 of them swim away.

How many lobsters are still swimming together?

____ – ____ = ____

____ + ____ = ____

Answer:

16 – 7 = 9

7 + 9 = 16

Explanation:

There are 16 lobsters swimming together

7 of them swim away

Related facts use the same numbers

These facts can help you add and subtract

16 – 7 = 9

Use related fact to solve

So, 7 + 9 = 16

Therefore, 9 lobsters are still swimming together.

**Test Practice**

Question 10.

Mark the related addition fact,

7 – 3 = 4

(A) 7 + 3 = 10

(B) 7 – 4 = 3

(C) 7 + 1 = 8

(D) 3 + 4 = 7

Answer:

(D) 3 + 4 = 7

Explanation:

3 + 4 = 7 is the related addition fact of the fact 7 – 3 = 4.

**Math at Home** Write an addition fact such as 3 + 9 = 12. Ask your child to write a related subtraction fact.