All the solutions provided in **McGraw Hill Math Grade 2 Answer Key PDF Chapter 1 Lesson 7 Count Bock to Subtract** will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 2 Answer Key Chapter 1 Lesson 7 Count Bock to Subtract

**Explore and Explain**

**Teacher Directions:** Draw a blue box around number 9. Count back 3. Circle that number red. Draw a green box around number 19. Count back 2. Circle that number yellow. Draw a purple box around 14. Count back 1. Circle that number orange.

Explanation:

**See and Show**

Find 10-3. Use a number line. Count back to subtract.

The answer is the difference.

Start with the great number.

**Count back to subtract. Use the number line.**

Question 1.

7 – 3 = ____

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 7 and 3 is 4

7 – 3 = 4

Question 2.

8 – 1 = ____

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 8 and 1 is 7

8 – 1 = 7

Question 3.

9 – 2 = ____

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 9 and 2 is 7

9 – 2 = 7

Question 4.

10 – 2 = ____

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 10 and 2 is 8

10 – 2 = 8

Question 5.

8 – 2 = ____

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 8 and 2 is 6

8 – 2 = 6

Question 6.

____ = 7 – 1

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 7 and 1 is 6

7 – 1 = 6

**Talk Math** Explain how you count back on a number line to subtract.

**On My Own**

**Count back to subtract. Use the number line.**

Question 7.

3 – 2 = _____

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 3 and 1 is 2

Question 8.

____ = 12 – 3

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 12 and 3 is 9

12 – 3 = 9

Question 9.

____ = 8 – 3

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 8 and 3 is 5

8 – 3 = 5

Question 10.

11 – 3 = ____

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 11 and 3 is 8

11 – 3 = 8

Question 11.

9 – 3 = ____

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 9 and 3 is 6

9 – 3 = 6

Question 12.

11 – 2 = ___

Answer:

Explanation:

For the difference we have to count back ward on the number line

The difference of 11 and 2 is 9

11 – 2 = 9

Question 13.

Answer:

Explanation:

The difference of 9 and 1 is 8

9 – 1 = 8

Question 14.

Answer:

Explanation:

The difference of 5 and 3 is 2

5 – 3 = 2

Question 15.

Answer:

Explanation:

The difference of 10 and 1 is 9

10 – 1 = 9

Question 16.

Answer:

Explanation:

The difference of 4 and 2 is 2

4 – 2 = 2

Question 17.

Answer:

Explanation:

The difference of 12 and 2 is 10

12 – 2 = 10

Question 18.

Answer:

Explanation:

The difference of 4 and 3 is 1

4 – 3 = 1

Question 19.

Answer:

Explanation:

The difference of 8 and 1 is 7

8 – 1 = 7

Question 20.

Answer:

Explanation:

The difference of 7 and 2 is 5

7 – 2 = 5

Question 21.

Answer:

Explanation:

The difference of 5 and 2 is 3

5 – 2 = 3

**Problem Solving**

Question 22.

Tanya has 12 books. She gives 3 away. How many books does she have now?

______ books

Answer:

9 books.

Explanation:

Tanya has 12 books.

She gives 3 away.

12 – 3 = 9

9 books that she have now.

Question 23.

Hank washes 9 windows at the pet store. He washes 2 windows in the morning. How many windows does he wash in the afternoon?

____ windows

Answer:

7 windows

Explanation:

Hank washes 9 windows at the pet store.

He washes 2 windows in the morning.

9 – 2 = 7

7 windows that he wash in the afternoon.

Question 24.

The animal shelter had 8 birds were adopted. 3 of the birds were adopted. How many birds were left at the animal shelter?

____ birds

Answer:

5 birds

Explanation:

The animal shelter had 8 birds were adopted.

3 of the birds were adopted.

8 – 3 = 5

5 birds were left at the animal shelter.

**Write Math** Explain how counting back can help you subtract.