# The constant of proportionality

In this lesson, we will learn about the the term 'constant of proportionality' and how it relates to how proportion works.

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which graph does not show to direct proportion?

1/5

Q2.Which graph shows direct proportion?

2/5

Q3.Which table does not shows direct proportion?

3/5

Q4.Which table does not shows direct proportion?

4/5

Q5.x and y are directly proportional as shown in the graph. What is the value of y when x = 10?

5/5

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which graph does not show to direct proportion?

1/5

Q2.Which graph shows direct proportion?

2/5

Q3.Which table does not shows direct proportion?

3/5

Q4.Which table does not shows direct proportion?

4/5

Q5.x and y are directly proportional as shown in the graph. What is the value of y when x = 10?

5/5

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

Quiz:

# Constant of proportionality.

Exit Quiz

Q1.Complete the sentence: When two quantities are in ........................ , when one variable doubles, the other doubles too.

1/8

Q2.Complete the sentence: When two quantities are in direction proportion, when one variable is zero, the other is .............

2/8

Q3.x and y are in direction proportion. When x is 4 y is 11. What is the value of y when x = 12?

3/8

Q4.The cost of T shirts online at £12 each. The postage charge is £3.50 per order. How much will it cost to order 2 T shirts?

4/8

Q5.Think about the previous question: Are the number of T-shirts and the cost in direct proportion?

5/8

Q6.Which table shows direct proportion?

6/8

Q7.What is the constant of proportionality in the table below?

7/8

Q8.What is the constant of proportionality between m and n?

8/8

Quiz:

# Constant of proportionality.

Exit Quiz

Q1.Complete the sentence: When two quantities are in ........................ , when one variable doubles, the other doubles too.

1/8

Q2.Complete the sentence: When two quantities are in direction proportion, when one variable is zero, the other is .............

2/8

Q3.x and y are in direction proportion. When x is 4 y is 11. What is the value of y when x = 12?

3/8

Q4.The cost of T shirts online at £12 each. The postage charge is £3.50 per order. How much will it cost to order 2 T shirts?

4/8

Q5.Think about the previous question: Are the number of T-shirts and the cost in direct proportion?

5/8

Q6.Which table shows direct proportion?

6/8

Q7.What is the constant of proportionality in the table below?

7/8

Q8.What is the constant of proportionality between m and n?

8/8

# Lesson summary: The constant of proportionality

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Climb stairs

On the spot:
Dance