Year 8
The constant of proportionality
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Lesson details
Key learning points
- In this lesson, we will learn about the the term 'constant of proportionality' and how it relates to how proportion works.
Licence
This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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5 Questions
Q1.
Which graph does not show to direct proportion?
A
B
Q2.
Which graph shows direct proportion?
B
C
Q3.
Which table does not shows direct proportion?
A
B
Q4.
Which table does not shows direct proportion?
B
C
Q5.
x and y are directly proportional as shown in the graph. What is the value of y when x = 10?
20
22
8 Questions
Q1.
Complete the sentence: When two quantities are in ........................ , when one variable doubles, the other doubles too.
constant of proportionality
indirect proportion
Q2.
Complete the sentence: When two quantities are in direction proportion, when one variable is zero, the other is .............
10
2
Q3.
x and y are in direction proportion. When x is 4 y is 11. What is the value of y when x = 12?
23
5
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?
£24
£31
Q5.
Think about the previous question: Are the number of T-shirts and the cost in direct proportion?
Yes
Q6.
Which table shows direct proportion?
Option 2
Option 3
Q7.
What is the constant of proportionality in the table below?
10
2
Q8.
What is the constant of proportionality between m and n?
4
5