Fraction of an Amount

To find a fraction of an amount, divide the amount by the denominator (bottom) of the fraction, then multiply by the numerator (top).

Unit fractions

$$\frac{1}{5}\times 40=40÷5=8$$

Non-unit fractions

$$\frac{2}{7}\times 21=(21÷7)\times 2=3\times 2=6$$

The word 'of'

If you see the word 'of' in a question, it means the same as times.

$$\frac{3}{4}\text{ of }20=\frac{3}{4}\times 20=15$$