Numeracy Worksheet - Castlebrae Community High School - 2012 Page 30
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47FHS Numeracy
Percentages:
Non- Calculator
contents page
Non- Calculator Methods
Combining Methods
The previous 2 methods can be combined so allowing us calculate any percentage.
Example 4
Find 23% of £15000
Level 3
10% = 1/10
divide by 10
10% of £15000
= £1500
20% of £15000
= 2 x £1500
20% = 2 x 10% multiply by 2
= £3000
1 % = 1/100
divide by 100
1% of £15000
= £150
3% of £15000
= 3 x 150
3% = 3 x 1% multiply by 3
= £450
23% of £15000
= £3000 + £450
= £3450
23% = 20% + 3%
Example 5
Calculate the sale price of a computer which costs £650
Level 3
and has a 15% discount
10% of £650 = £65
5% = 1/2 of 10% divide by 2
5% of £650 = £32.50
so 15% of £650 = £65 + £32.50 = £97.50
15% = 10% + 5%
Total price = £650 - £97.50 = £552.50
30
L Watson 2012
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