# McGraw Hill My Math Grade 1 Chapter 3 Lesson 3 Answer Key Use a Number Line to Add

All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 3 Lesson 3 Use a Number Line to Add will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 1 Answer Key Chapter 3 Lesson 3 Use a Number Line to Add

Explore and Explain  Explanation:
A car is driving across the bridge
It starts at the number 4
It drives 3 spaces to the right
I started with the greater number 4
Moved 3 spaces
Now, I am at 7
So, the car stops at 7
The addition number sentence is 4 + 3 = 7.

Teacher Directions: Use to model. A car is driving across the bridge. It starts at the number 4. It drives 3 spaces to the right. Where does the car stop? Write the addition number sentence.

See and Show

You can use a number line to add. Start with the greater number and count on by moving to the right. Use the number line to add. Show your work. Write the sum.

Question 1.
6 + 2 = ____  Explanation:
I started with the greater number 6
Moved 2 spaces
Now, I am at 8
So, the addition sentence is 6 + 2 = 8.

Question 2.
8 + 2 = ____  Explanation:
I started with the greater number 8
Moved 2 spaces
Now, I am at 10
So, the addition sentence is 8 + 2 = 10.

Question 3.
1 + 4 = ____  Explanation:
I started with the greater number 4
Moved 1 space
Now, I am at 5
So, the addition sentence is 1 + 4 = 5.

Question 4.
7 + 2 = ____  Explanation:
I started with the greater number 7
Moved 2 spaces
Now, I am at 9
So, the addition sentence is 7 + 2 = 9.

Addition on a number line is done by the counting logic. To add a positive number, we move towards the right-hand side of the number line, whereas, to add a negative number, we move in the backward direction (left side) on the number line.

On My Own

Use the number line to add. Write the sum. Question 5.
3 + 4 = ____ Explanation:
I started with the greater number 4
Moved 3 spaces
Now, I am at 7
So, the addition sentence is 3 + 4  = 7.

Question 6.
2 + 9 = ____ Explanation:
I started with the greater number 9
Moved 2 spaces
Now, I am at 11
So, the addition sentence is 2 + 9 = 11.

Question 7.
1 + 8 = ___ Explanation:
I started with the greater number 8
Moved 1 space
Now, I am at 9
So, the addition sentence is 1 + 8 = 9.

Question 8.
7 + 3 = ____ Explanation:
I started with the greater number 7
Moved 3 spaces
Now, I am at 10
So, the addition sentence is 7 + 3 = 10.

Question 9.  Explanation:
I started with the greater number 6
Counted on 1 more
Now, I am at 7
So, the addition sentence is 6 + 1 = 7.

Question 10.  Explanation:
I started with the greater number 8
Counted on 3 more
Now, I am at 11
So, the addition sentence is 8 + 3 = 11.

Question 11.  Explanation:
I started with the greater number 9
Counted on 1 more
Now, I am at 10
So, the addition sentence is 1 + 9 = 10.

Question 12.  Explanation:
I started with the greater number 7
Counted on 2 more
Now, I am at 9
So, the addition sentence is 2 + 7 = 9.

Question 13.  Explanation:
I started with the greater number 9
Counted on 3 more
Now, I am at 12
So, the addition sentence is 9 + 3 = 12.

Question 14.  Explanation:
I started with the greater number 5
Counted on 2 more
Now, I am at 7
So, the addition sentence is 5 + 2 = 7.

Question 15.  Explanation:
I started with the greater number 7
Counted on 1 more
Now, I am at 8
So, the addition sentence is 1 + 7 = 8.

Question 16.  Explanation:
I started with the greater number 4
Counted on 2 more
Now, I am at 6
So, the addition sentence is 6.

Question 17.  Explanation:
I started with the greater number 6
Counted on 3 more
Now, I am at 6
So, the addition sentence is 6 + 3 = 9.

Problem Solving

Use the number line to solve. Question 18.
Amelio saw 5 bikes. His brother saw 2 bikes. How many bikes did they see in all?
___ bikes Explanation:
Amelio saw 5 bikes
His brother saw 2 bikes
I started with the greater number 5
Moved 2 spaces
Now, I am at 7
The addition sentence is 5 + 2 = 7
So, they saw 7 bikes in all.

Question 19.
Liz saw 8 pigeons. Logan saw 2 pigeons. How many pigeons did they see in all? ____ pigeons Explanation:
Liz saw 8 pigeons
Logan saw 2 pigeons
I started with the greater number 8
Moved 2 spaces
Now, I am at 10
The addition sentence is 8 + 2 = 10
So, they saw 10 pigeons in all.

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The reason to start with the greater number when adding on a number line is that it helps you to deal in which direction you have to move either on right or left of number line of that number.

### McGraw Hill My Math Grade 1 Chapter 3 Lesson 3 My Homework Answer Key

Practice

Use the number Sine above to add. Write the sum.

Question 1.
1 + 8 = ____ Explanation:
I started with the greater number 8
Moved 1 space
Now, I am at 9
So, the addition sentence is 8 + 1 = 9.

Question 2.
8 + 2 = ____ Explanation:
I started with the greater number 8
Moved 2 spaces
Now, I am at 10
So, the addition sentence is 8 + 2 = 10.

Question 3.
5 + 3 = ___ Explanation:
I started with the greater number 5
Moved 3 spaces
Now, I am at 8
So, the addition sentence is 5 + 3 = 8.

Question 4.
8 + 3 = ___ Explanation:
I started with the greater number 8
Moved 3 spaces
Now, I am at 11
So, the addition sentence is 8 + 3 = 11.

Question 5.
7 + 2 = ___ Explanation:
I started with the greater number 7
Moved 2 spaces
Now, I am at 9
So, the addition sentence is 7 + 2 = 9.

Question 6.
4 + 1 = ___ Explanation:
I started with the greater number 4
Moved 1 space
Now, I am at 5
So, the addition sentence is 4 + 1 = 5.

Question 7.  Explanation:
I started with the greater number 9
Counted on 2 more
Now, I am at 11
So, the addition sentence is 9 + 2 = 11.

Question 8.  Explanation:
I started with the greater number 4
Counted on 3 more
Now, I am at 7
So, the addition sentence is 4 + 3 = 7.

Question 9.  Explanation:
I started with the greater number 6
Counted on 3 more
Now, I am at 9
So, the addition sentence is 6 + 3 = 9.

Use the number line to solve. Question 10.
There are 6 people waiting for a taxi. 2 more people get in line. How many people are waiting for a taxi in all?
_____ people Explanation:
There are 6 people waiting for a taxi
2 more people get in line
I started with the greater number 6
Moved 2 spaces
Now, I am at 8
The addition sentence is 6 + 2 = 8
So, 8 people are waiting for a taxi in all.

Question 11.
Abigail puts 9 toy planes and 3 toy cars on a shelf. How many toys did she put on the shelf?
_____ toys  Explanation:
Abigail puts 9 toy planes and 3 toy cars on a shelf
I started with the greater number 9
Moved 3 spaces
Now, I am at 12
The addition sentence is 9 + 3 = 12
So, Abigail puts 12 toys on the shelf.

Vocabulary Check

Complete each sentence.

number    line count on

Question 12.
number

Explanation: