All the solutions provided inÂ **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**

Answer:

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.

**Helpful Hint**

Start with the greater number. 5, 6, 7, 8

**Use the number line to add. Show your work. Write the sum.**

Question 1.

6 + 2 = ____

Answer:

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 = ____

Answer:

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 = ____

Answer:

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 = ____

Answer:

Explanation:

I started with the greater number 7

Moved 2 spaces

Now, I am at 9

So, the addition sentence is 7 + 2 = 9.

**Talk Math** How does a number line help you add?

Answer:

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 = ____

Answer:

Explanation:

I started with the greater number 4

Moved 3 spaces

Now, I am at 7

So, the addition sentence is 3 + 4Â = 7.

Question 6.

2 + 9 = ____

Answer:

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 = ___

Answer:

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 = ____

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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

Answer:

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

Answer:

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.

**Write Math** Why do you start with the greater number when adding on a number line?

_____________________________

_____________________________

_____________________________

_____________________________

Answer:

The reason to start with the greater number when adding on a number line is thatÂ 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 = ____

Answer:

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 = ____

Answer:

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 = ___

Answer:

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 = ___

Answer:

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 = ___

Answer:

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 = ___

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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

Answer:

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

Answer:

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.**

numberÂ Â line count on

Question 12.

When you add on a ______, start with the greater number and move to the right.

Answer:

number

Explanation:

When you add on a number, start with the greater number and move to the right.

Question 13.

To ____, start with the greater number.

Answer:

line count on

Explanation:

To line count on, start with the greater number.

**Math at Home** Help your child create a number line from 0 to 10. Then, ask your child to use the number line to show 1 + 9.