Numeracy Worksheet - Castlebrae Community High School - 2012 Page 32
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47FHS Numeracy
contents page
Percentages: One Quantity as a % of Another
Finding the percentage
To find one quantity as a percentage of another:
Make a FRACTION then multiply the fraction by 100
a
X 100 => %
b
Example 1
There are 30 pupils in Class 3A3. 18 are girls. What percentage of
Level 3
class 3A3 are girls?
18 out of 30 are girls
18
x 100
30
= 0.6 x 100
= 60%
of 3A3 are girls
Example 2
James scored 36 out of 44 his biology test. What is his
Level 3
percentage mark?
36
Score =
x 100
44
= 0.81818… x 100
= 81.818..%
= 82%
(see rounding)
Example 3
In class 1X1, 14 pupils had brown hair, 6 pupils had blonde hair, 3
had black hair and 2 had red hair. What percentage of the pupils
Level 3
were blonde?
Total number of pupils = 14 + 6 + 3 + 2 = 25
6 out of 25 were blonde.
6
x 100
25
= 0.24 x 100
= 24%
were blonde
32
L Watson 2012
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