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Use Direct Proportion in Table Form

In this worksheet, students will use direct proportion to find values.

Worksheet Overview

In this activity, we will find direct proportion when it is presented in table form.

 

girl and question marks

 

We have seen these before when we are creating coordinates to draw graphs.

For example y = 2x

 

 

We follow the rule of y = 2 multiplied by the x value:

1 x 2 = 2

2 x 2 = 4

3 x 2 = 6

4 x 2 = 8

 

 

The graph can now be plotted!

 

Does that make sense?

 

happy girl

 

Great! In this activity, we will be using the same idea, but we have to find the rule.

Confused? Let's have a look at an example to help!

 

Example

y is directly proportional to x

Complete the table below:

 

 

Answer

We need to look at the table to see where we have the x and the y values.

We can use these to find the rule.

 

We have x = 5 when y = 20

To find the multiplier, we can do 20 ÷ 5 = 4

So, we can see that y = 4x

or

the y values are 4 times bigger than the x values.

 

We can now fill in the gaps:

When x = 3, then y = 4 x 3 = 12

When x = 8, then y = 4 x 8 = 32

 

 

Let's try some more of these!

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