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Maths I

Percentages

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Finding a percentage of a quantity

You will have to be able to use the basic skills of doing percentages for many different calculations in the exam. Most of these questions will be in a real life context.

You will find further practice of percentages in some of the other number revision bites, using real life contexts.

Percent means 'out of one hundred', so 15% means 15 out of one hundred.

15 \% = {15 \over 100} = 0.15

Example

Find 30 \% of \pounds 800

Teenage girl looking happy with lots of twenty pound notes.

 

30 \% of \pounds 800

 

{30 \over 100} \times \pounds 800

 

= 0.3 \times \pounds 800

= \pounds 240

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