Percentages

Calculations can be carried out using percentages of shapes and quantities. We can calculate percentage increase and decrease, as well as express a quantity as a percentage of another quantity.

Part of

Application of Maths

Numeracy skills

Finding a percentage of a quantity

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

$15\% = \frac{{15}}{{100}} = 0.15$

Example

Find $30\% \,of\,\pounds800$

$= \frac{{30}}{{100}} \times 800$

$= 0.3 \times 800$

$= \pounds240$

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Percentages

Finding a percentage of a quantity

Example

National 5 Subjects