# Using Number Lines to Add

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Using Number Lines to Add
CCSS.MATH.CONTENT.1.OA.A.2

## Information about the videoUsing Number Lines to Add

### Contents

Mr. Squeaks wants to test out the blender he just built. He has some lady finger bananas, strawberries, and blueberries and asks Imani to bring some more of each. In order to see how much of each ingredient he has in all, he will use addition number lines. But Mr. Squeaks doesn’t know how to add using a number line! Thankfully we will learn how to add numbers on a number line.

### What is Number Line Addition?

An addition number line is a straight line with numbers spaced apart equally. What is Addition on a Number Line? When we use a number line for addition, that means we are modeling addition on a number line. Using a number line model for addition, helps us keep track of what we are adding easily. In the next section you will learn how to use a number line for addition.

#### How to Show Addition on a Number Line

Showing addition on a number line is very simple if you follow the steps on how to add numbers on the number line. These steps tell you how to represent addition on number line, or how to use a number line for addition. Here are the steps on how to do addition with number line:

• Step 1: Find the starting number or the amount we have on the number line
• Step 2: Count the number we are adding, moving to the right
• Step 3: Write the number you land on in the total, this is the answer

If you’re still wondering how to use a number line for addition, the next section will show how to add 2 numbers using a number line.

#### Number Line Addition Example

Here, we need to add four and five using addition using the number line. Let’s use the steps on how to do addition with number line:

• Step 1: Find the starting number or the amount we have on the number line

• Step 2: Count the number we are adding, moving to the right

• Step 3: Write the number you land on in the total, this is the answer

#### Number Line Addition Summary

How do you do addition on a number line? Remember, showing addition on a number line is very simple if you follow the steps on how to add numbers on the number line:

• Step 1: Find the starting number or the amount we have on the number line.
• Step 2: Count the number we are adding, moving to the RIGHT.
• Step 3: Write the number you land on in the total, this is the answer.

Have you practiced yet? On this website you can practice long addition on a number line and find number line addition worksheets along with other activities, and exercises.

## Using Number Lines to Add Exercise

Would you like to practice what you’ve just learned? Practice problems for this video Using Number Lines to Add help you practice and recap your knowledge.
• ### How many bananas do they have altogether?

Hints

Use the picture of the number line to help you.

Start at 2 and count 5 jumps on the number line. The number you end on is the answer.

Solution

Mr. Squeaks and Imani have seven bananas!

• Mr. Squeaks had two bananas, so we find 2 on the number line.
• We then count 5 jumps forwards because Imani brought five bananas.
• We will end on 7, so the answer is seven bananas.
• You could have also found 5 on the number line and counted 2 jumps forwards.
• We would still end on 7 this way too.
• ### How many strawberries do they have?

Hints

Remember, you are trying to solve 9 + 6.

Find 9 on the number line and count 6 jumps forwards.

Solution

Mr. Squeaks had nine strawberries and Imani brought six more, so we are solving 9 + 6.

• First, find 9 on the number line.
• Next, jump forward 6 spaces, this time highlighting each jump in yellow.
• We end on 15 so that is our answer. Highlight it in green.
• Mr. Squeaks and Imani had fifteen strawberries altogether.
• Also, you can also start at 6 and count 9 jumps forward.
• You would still land on 15.
• However, it is often easier to start with the larger number.
• ### Can you add the fruit to find the total number of ingredients in each smoothie?

Hints

How many pieces of each fruit are there? For example, here we would be adding 2 + 2.

You can then use a number line to find the total like this.

2 + 2 = 4

It is a good idea to start with the larger number.

Solution

This number line shows us how to find the total amount of fruit in the mango and peach smoothie.

• We would start by finding 7 on the number line as this is the larger number.
• We could then count 2 jumps forwards.
• We land on 9.
• So, there are 9 pieces of fruit in this smoothie.
• We could have also started at 2 and counted 7 jumps forward. We would still land on 9.
For the blueberry and banana smoothie
• We would start by finding 13 on the number line as this is the larger number.
• We could then count 5 jumps forward.
• We land on 18.
• So, there are 18 pieces of fruit in this smoothie.
• We could have also started at 5 and counted 13 jumps forward. We would still land on 18.
For the pineapple and cherry smoothie
• We would start by finding 11 on the number line as this is the larger number.
• We could then count 2 jumps forward.
• We land on 13.
• So, there are 13 pieces of fruit in this smoothie.
• We could have also started at 2 and counted 11 jumps forwards. We would still land on 13.
For the strawberry and raspberry smoothie
• We would start by finding 9 on the number line as this is the larger number.
• We could then count 5 jumps forward.
• We land on 14.
• So, there are 14 pieces of fruit in this smoothie.
• We could have also started at 5 and counted 9 jumps forwards. We would still land on 14.
• ### Can you help Mr. Squeaks and Imani with their recipes?

Hints

If you were adding 5 + 4, you would find the number 5 and then count 4 jumps forward to reach the answer, 9.

Start at the larger number and count on the smaller number.

Solution
• For smoothie number one, we were adding 15 + 3 to find the total ingredients.
• First we find 15 on the number line.
• We then count 3 jumps forwards.
• We will land on 18, so that is our answer.

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• To find the total ingredients for smoothie number two, we needed to add 7 + 6 to get a total of 13.
• To find the total ingredients for smoothie number three, we needed to add 8 + 9 to get a total of 17.
• To find the total ingredients for smoothie number four, we needed to add 12 + 7 to get a total of 19.
• To find the total ingredients for smoothie number five, we needed to add 11 + 9 to get a total of 20.
_______________________________________________________

Remember:

• It doesn't matter which number we start with when we are adding, but it is often a good idea to start with the larger number so you do fewer jumps.
• ### How many berries do they have?

Hints

How many blueberries did Mr. Squeaks have? This is your starting number. We are starting with this number because it is the biggest number.

How many raspberries did Imani bring? This is the number you are adding on.

Use the jumps on the number line to help you to find the total number of berries.

Solution

They have eleven berries altogether.

• Mr. Squeaks had 8 blueberries.
• Imani brought 3 raspberries.
• Using a number line to help us we start at 8 and count on 3 more.
• We end on 11, so that is our answer.
• This problem could also be solved by starting at 3 and counting 8 jumps forwards.
• We would still land on 11 if we did it this way.
• ### Can you help Mr. Squeaks with his challenge?

Hints

It is a good idea to start with the larger number when adding.

Can you use your knowledge of doubles? For example, what pair of numbers do you know that equal 10?

Solution

Here are the different ways to make 10, 15 and 20 from this problem.

For example:

• To find the answer for 12 + 8:
• We could find 12 on the number line.
• We could then jump forward 8 spaces.
• We will land on 20, so that is our answer.
Can you think of any other ways you could make 10, 15 or 20?