# McGraw Hill My Math Grade 1 Chapter 4 Lesson 2 Answer Key Use a Number Line to Subtract

All the solutions provided inÂ McGraw Hill My Math Grade 1 Answer Key PDF Chapter 4 Lesson 2 Use a Number Line to Subtract will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 1 Answer Key Chapter 4 Lesson 2 Use a Number Line to Subtract

Explore and Explain

Answer:

Explanation:
A store has 11 beach balls to sell
It sells 2 of them
I used number line to subtract
Start at 11
Count back 2
10, 9
So, 11 – 2 = 9
So, 9 beach balls are left.

Teacher Directions: Use a paper clip to count back on the number line. A store has 11 beach balls to sell. It sells 2 of them. How many beach balls do they have left? Write the number.

See and Show

You can use a number line to subtract.
9 – 3 = 6

Helpful Hint
Start at 9. Count back 3 to find the difference. 9, 8, 7, 6.

Use the number line to subtract Show your work. Write the difference.

Question 1.
8 – 2 = ____

Answer:

Explanation:
I used number line to subtract
Start at 8
Count back 2
7, 6
So, 8 – 2 = 6.

Question 2.
10 – 3 = ____

Answer:

Explanation:
I used number line to subtract
Start at 10
Count back 3
9, 8, 7
So, 10 – 3 = 7.

Question 3.
5 – 1 = ____

Answer:

Explanation:
I used number line to subtract
Start at 5
Count back 1
4
So, 5 – 1 = 4.

Question 4.
12 – 3 = ____

Answer:

Explanation:
I used number line to subtract
Start at 12
Count back 3
11, 10, 9
So, 12 – 3 = 9.

Talk Math
Can you only use the number line to help you subtract numbers? Explain.
Answer:
Yes, one can do addition and subtraction on a single number line. For example, 3 + 3Â  need to represent by a number line, then we first take the number 3 on the number line. After that move towards the right with 3 units as the addition takes place.
On My Own

Use the number line to help you subtract. Write the difference.

Question 5.

Answer:

Explanation:
I used number line to subtract
Start at 8
Count back 3
7, 6, 5
So, 8 – 3 = 5.

Question 6.

Answer:

Explanation:
I used number line to subtract
Start at 7
Count back 3
6, 5, 4
So, 7 – 3 = 4.

Question 7.

Answer:

Explanation:
I used number line to subtract
Start at 10
Count back 2
9,
So, 10 – 2 = 8.

Question 8.

Answer:

Explanation:
I used number line to subtract
Start at 6
Count back 2
5, 4
So, 6 – 2 = 4.

Question 9.

Answer:

Explanation:
I used number line to subtract
Start at 7
Count back 1
6
So, 7 – 1 = 6.

Question 10.

Answer:

Explanation:
I used number line to subtract
Start at 11
Count back 3
10, 9, 8
So, 11 – 3 = 8.

Question 11.
12 – 1 = ____
Answer:

Explanation:
I used number line to subtract
Start at 12
Count back 1
11
So, 12 – 1 = 11.

Question 12.
9 – 2 = ____
Answer:

Explanation:
I used number line to subtract
Start at 9
Count back 2
8, 7
So, 9 – 2 = 7.

Question 13.
10 – 1 = ____
Answer:

Explanation:
I used number line to subtract
Start at 10
Count back 1
9
So, 10 – 1 = 9.

Question 14.
11 – 2 = ____
Answer:

Explanation:
I used number line to subtract
Start at 11
Count back 2
10, 9
So, 11 – 2 = 9.

Question 15.
5 – 3 = ____
Answer:

Explanation:
I used number line to subtract
Start at 5
Count back 2
4, 3, 2
So, 5 – 3 = 2.

Question 16.
10 – 3 = ____
Answer:

Explanation:
I used number line to subtract
Start at 10
Count back 3
9, 8, 7
So, 10 – 3 = 7.

Question 17.
12 – 2 = ___
Answer:

Explanation:
I used number line to subtract
Start at 12
Count back 2
11, 10
So, 12 – 2 = 10.

Question 18.
7 – 2 = ____
Answer:

Explanation:
I used number line to subtract
Start at 7
Count back 2
6, 5
So, 7 – 2 = 5.

Problem Solving

Question 19.
Ava sees 12 sharks. 2 of them swim away. How many sharks does Ava see now?
____ sharks
Answer:

Explanation:
Ava sees 12 sharks
2 of them swim away
I used number line to subtract
Start at 10
Count back 2
11, 10
So, 12- 2 = 10
Ava sees now 10 sharks.

Question 20.
There are 11 manatees near the shore. 3 of them swim away. How many manatees are still near the shore?

____ manatees
Answer:

Explanation:
There are 11 manatees near the shore
3 of them swim away
I used number line to subtract
Start at 11
Count back 3
10, 9, 8
So, 11 – 3 = 8
8 manatees are still near the shore.

Write Math How do you use a number line help you subtract? Explain.
______________________
______________________
______________________
______________________
Answer:
Subtraction on a number line is done by the counting logic. To subtract a positive number, we move towards the left-hand side of the number line. For example, 6 – 2 can be calculated by taking 6 as the starting number and moving 2 units towards the left on a number line which gives the result as 4.

### McGraw Hill My Math Grade 1 Chapter 4 Lesson 2 My Homework Answer Key

Practice

Use the number line to subtract. Show your work. Write the difference.

Question 1.
10 – 3 = ____

Answer:

Explanation:
I used number line to subtract
Start at 10
Count back 3
9, 8, 7
So, 10 – 3 = 7.

Question 2.
6 – 2 = ____

Answer:

Explanation:
I used number line to subtract
Start at 6
Count back 2
5, 4
So, 6 – 2 = 4.

Question 3.
12 – 3 = ____

Answer:

Explanation:
I used number line to subtract
Start at 12
Count back 3
11, 10, 9
So, 12 – 3 = 9.

Question 4.
5 – 2 = ____

Answer:

Explanation:
I used number line to subtract
Start at 5
Count back 2
4, 3
So, 5 – 2 = 3.

Use the number line to help you subtract. Write the difference.

Question 5.
11 – 2 = ____
Answer:

Explanation:
I used number line to subtract
Start at 11
Count back 2
10, 9
So, 11 – 2 = 9.

Question 6.
6 – 1 = ____
Answer:

Explanation:
I used number line to subtract
Start at 6
Count back 1
5
So, 6 – 1 = 5.

Question 7.
9 – 3 = ____
Answer:

Explanation:
I used number line to subtract
Start at 9
Count back 3
8, 7, 6
So, 9 – 3 = 6.

Question 8.
12 – 1 = ____
Answer:

Explanation:
I used number line to subtract
Start at 12
Count back 1
11
So, 12 – 1 = 11.

Question 9.

Answer:

Explanation:
I used number line to subtract
Start at 6
Count back 1
5
So, 6 – 1 = 5.

Question 10.

Answer:

Explanation:
I used number line to subtract
Start at 7
Count back 3
6, 5, 4
So, 7 – 3 = 4.

Question 11.

Answer:

Explanation:
I used number line to subtract
Start at 8
Count back 2
7, 6
So, 8 – 2 = 6.

Question 12.
There are 10 sharks swimming. 2 of the sharks swim away. How many sharks are still swimming?

_______ sharks
Answer:

Explanation:
There are 10 sharks swimming
2 of the sharks swim away
I used number line to subtract
Start at 10
Count back 2
9, 8
So, 10 – 2 = 8
8 sharks are still swimming.

Test Practice

Question 13.
10 – 3 = ____
(A) 0
(B) 3
(C) 7
(D) 8
Answer:

Explanation:
I used number line to subtract
Start at 10
Count back 3
9, 8, 7
So, 10 – 3 = 7.

Math at Home Have your child show 11-3 using a number line. Have him or her explain how they are using the number line as they subtract.
Answer:

Explanation:
I used number line to subtract
Start at 11
Count back 3
10, 9, 8
So, 11 – 3 = 8.

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