Numeracy Worksheet - Castlebrae Community High School - 2012 Page 31
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47FHS Numeracy
Percentages:
contents page
Calculator
Calculator Method
To find the percentage of a quantity using a calculator, change the percentage to
a decimal, then multiply.
Example 1
Find 23% of £15000
Level 3
23% of £15000
23
=
x 15 000
100
= 0.23 x £15000
= £3450
We NEVER use the % button on calculators.
The methods taught in the mathematics department are all based
on converting percentages to decimals.
Example 2
House prices increased by 19% over a one year period.
Level 3
What is the new value of a house which was valued at £236000 at
the start of the year?
Increase
= 19% of £236 000
19
=
x 236 000
100
= 0.19 x £236 000
= £44 840
Value at end of year
= original value + increase
= £236 000 + £44 840
= £280 840
The new value of the house is £280 840
31
L Watson 2012
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