Numeracy Worksheet - Castlebrae Community High School - 2012 Page 29
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47FHS Numeracy
Percentages:
Non- Calculator
contents page
There are many ways to calculate percentages of a quantity. Some
of the common ways are shown
below.
Non- Calculator Methods
Method 1
Using Equivalent Fractions (use table on previous page)
Example 1
Find 25% of £48
Level 2
If we use a more complicated number then the
25% of £48
level would go up to 3.
1
=
of 48
4
= 48
4
= £12
Method 2
Using 1% (1% - 9%)
In this method, first find 1% of the quantity (by dividing by 100), then multiply
to give the required value.
Example 2
Find 9% of 200g
Level 3
1% of 200g
1
=
of 200
100
= 200
so 9% of 200g = 9 x 2g
100
= 18g
= 2g
Method 3
Using 10% (10% and multiples of 10%)
This method is similar to the one above. First find 10% (by dividing by 10), then
multiply to give the required value.
Example 3
Find 70% of £35
Level 3
10% of £35
1
=
of 35
10
= 35
so 70% of £35 = 7 x £3.50
10
= £24.50
= £3.50
so 70% of £35 = 7 x £3.50
29
L Watson 2012
= £24.50
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