Numeracy Worksheet - Castlebrae Community High School - 2012 Page 36
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47FHS Numeracy
Proportion
contents page
Two quantities are said to be in direct proportion if when one
doubles the other doubles etc.
We can use proportion to solve problems.
It is often useful to make a table when solving problems involving proportion.
Example 1 A car factory produces 1500 cars in 30 days. How many cars would they
Level 3
produce in 90 days?
Days
Cars
30
1500
We can change 30 into 90 if we
x3
x3
multiply by 3. So, multiply 1500
90
4500
by 3 also.
The factory would produce 4500 cars in 90 days.
Example 2
The Davidson’s are off to France.
Level 3
The exchange rate is 1.4 euros for a £1. How many euros do they get
for £500?
£
Euros
1
1.4
x 500
x 500
They get 700 euros for £500
500
700
Example 3
5 apples cost £2.25. How much do 8 apples cost?
Level 3
Apples
Cost
5
2.25
÷ 5
÷5
We can’t change 5 directly into 8 but
1
0.45
if we reduce 5 to 1 we can then find
the cost of any amount of apples.
x 8
x 8
8
3.60
8 apples cost £3.60
36
L Watson 2012
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