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Division on a Number Line
CCSS.MATH.CONTENT.4.NBT.B.6

## Information about the videoDivision on a Number Line

### In this division on a number line video…

Mr. Squeaks is trying to add enough fireflies to light up his runway, so he can take off safely. In order to do that he needs to divide the lights evenly along the runway. There’s just one problem, Mr. Squeaks doesn’t know how to divide on a number line! Since the runway is similar to a number line, we can write the division sentences and use a number line for division to help him light up the runway so he can take off safely!

### How do you Divide on a Number Line?

#### What is a Number Line in Division?

Using number lines for division can be very helpful because it can help us understand or explain a division problem. First, let’s review about number lines before we use a number line to solve division.

#### What is a Number Line?

A number line is a straight line with numbers placed at equal intervals or equal distances apart. You’re probably already familiar with a number line but how do you use the number line method in division?

#### What is the Number Line Method?

The number line method allows you to show division on the number line by drawing hops or skips based on the divisor, or the number we are dividing by.

#### How do you Show Division on a Number Line?

When you want to use the number line to divide, there are three easy steps to follow:

• Step 1: Circle the dividend on the number line
• Step 2: Skip count up or draw hops on the number line
• Step 3: Count the number of skips or hops to get the quotient

#### Division Using a Number Line Examples

Even after hearing the steps above you may still be wondering exactly how to do division on a number line. Below is one example of number line division from the video.

First, we need to find the quotient of twelve divided by six using the number line. The first step is to circle the dividend or the number being divided. The second step is to skip count up or draw hops on the number line based on the divisor, or number being divided. The third step is to count the number of skips or hops to get the quotient, which in this case is two. #### Number Line Division Summary

The number line method allows you to show division on the number line by drawing hops or skips based on the divisor, or the number we are dividing by. How do you divide using a number line? Remember when you want to use the number line to divide, there are three easy steps to follow:

• Step 1: Circle the dividend on the number line
• Step 2: Skip count up or draw hops on the number line
• Step 3: Count the number of skips or hops to get the quotient

Want to practice number line division more? On this website you can also find exercises, a division on a number line worksheet or division on a number line worksheets if you need even more practice!

### TranscriptDivision on a Number Line

Mr. Squeaks is trying to get a closer look at the half moon using his plane. There's just one problem(...)he can't take off from the runway safely because it is too dark! It looks like Mr. Squeaks has an idea... he wants to use the fireflies to light up the runway! Before he can do that, he needs to come up with a plan so the lights are divided evenly along the runway. We will help Mr. Squeaks divide pairs of lights evenly using [title] "Division on a Number Line". The runway is twelve feet long and Mr. Squeaks would like to place a pair of lights every six feet. He wants to use a NUMBER LINE the same length as the runway to help him. First, we will be calculating TWELVE divided by SIX. Before we start, let's review the parts of a division problem. The DIVIDEND is the number being divided, in this case the number twelve. The DIVISOR, or the number we are dividing by, is six. The QUOTIENT will be the answer. To find the quotient using a number line we can follow three easy steps. First, circle the DIVIDEND on the number line(...)here the DIVIDEND is the number TWELVE. Second, skip count up the number line by the DIVISOR or SIX to the DIVIDEND. [enthusiastic] Let's skip count by six together! six (...) twelve! The third step is to count the number of skips to get the quotient(...)let's count them together! one (...) two (...) twelve divided by six equals two. [goes back to Mr. Squeaks] Mr. Squeaks places two pairs of lights along the runway. [worried] Oh no, it's not bright enough! Let's help Mr. Squeaks place a pair of lights every four feet. That means we will solve TWELVE divided by FOUR. First, circle the DIVIDEND on the number line(...) in this case the number TWELVE. What is the second step? (...) Skip count up the number line by the DIVISOR or FOUR to TWELVE. Let's skip count together! four (...) eight (...) twelve! What is the number of skips? (...) The number of skips is three, (...) so twelve divided by four equals three. Let's see if that's enough light for the runway now. [disappointed] It's better, but still not safe enough. Mr. Squeaks thinks if we put a pair of lights every two feet, he will finally be able to fly(...) let's help him calculate to see if he's right! What is the first step? (...) First, circle the the number TWELVE. What is the second step? (...) Second, skip count up the number line by TWO to TWELVE. This time, let's skip count on your own to see if you can find the quotient. (...) When you skip count by TWO up the number line (...) twelve divided by two equals six... which means Mr. Squeaks has six pairs of lights along the runway now. Remember, (...) to find the quotient using a number line you can follow three easy steps. The first step is to circle the DIVIDEND on the number line. The second step is to skip count up the number line by the DIVISOR to the DIVIDEND. The third step is to count the number of skips to get the quotient. Let's check in with Mr. Squeaks to see if he has enough light for the runway now! [Mr. Squeaks:] Weeeee! I think Mr. Squeaks forgot something...

## Division on a Number Line Exercise

Would you like to practice what you’ve just learned? Practice problems for this video Division on a Number Line help you practice and recap your knowledge.
• ### Calculate the distance to where each firefly must go.

Hints

Start at 0. Count in skips of 5 until you get to 30.

Solution

Starting from 0 we jump in fives until we get to 30. We should have landed at 5, 10, 15, 20, 25 and 30

• ### Can you fill in the missing numbers?

Hints

What is the number we need to divide?

Make sure you start from 0

How many jumps has it taken to get from 0 to 20. Use the image to help you.

Solution

We jumped in steps of 4 until we reached the number 20.

We started from the number 0 and then jumped in steps of 4cm.

It took 5 jumps until we reached 20.

• ### Can you solve the following calculations?

Hints

Start from 0 on the number line. Look at the divisor . This is the amount you need to jump from 0 until you reach the dividend.

In this example 10 is the dividend and 2 is the divisor. When we jump in twos to 10 we get the answer of 5.

Draw a numberline from 0 - 12.

Look at the divisor and then take jumps in that number, remembering to start from 0. If the divisor is 3 draw jumps of 3 until you get to your dividend.

Solution

12 $\div$ 3 = 4

We start at 0 and draw a number line to 12 which is our dividend. We then look at our divisor which is 3. Now we need to jump in groups of 3 until we reach 12. Then to get our answer we need count the amount of jumps it has taken to get from 0 to 12.

Following these steps we can also work out that

12 $\div$ 6 = 2

12 $\div$ 2 = 6

12 $\div$ 4 = 3

• ### Can you fill in the gaps to Mr Squeak's problem?

Hints

Identify the different parts of your calculation.

The dividend = how many sweets does Mr Squeaks need to share?

Divisor = how many people Mr Squeaks needs to share with.

Where do we need to start on the number line?

Count how many jumps it took from 0 to reach 10.

Solution

Mr Squeak's has 10 sweets. He wants to share these equally between 2.

He needs to divide 10 by 2. Mr Squeak's starts off by finding 0 on the number line and needs to do a jump of 2.

The next number he lands on after 2 will be 4 followed by 6. How many jumps did Mr Squeak's make? 5.

• ### Can you highlight the different parts of the calculation?

Hints

The dividend is the number you are dividing.

The divisor is the number you are dividing by.

Solution

The whole number we need to divide is the dividend which is 20.

We need to divide by the divisor which is 5.

• ### Can you match the the corresponding images and calculations.

Hints

Look at the calculations. Identify what the dividend is and look for this in the images. The dividend is the number you are dividing.

Look at the calculations. Identify the divisor. This will let you know the size of the jumps to look for.

Solution

18 $\div$ 6 = 3

12 $\div$ 3 = 4

10 $\div$ 2 = 5