Fractions, decimals and percentages

A fraction, a decimal and a percentage can all describe the same amount. To write a fraction as a percentage, multiply by 100: 1/4 = 1 × 100 ÷ 4 = 25, so 1/4 = 25%. It helps to learn the common ones by heart — 1/2 = 50%, 1/4 = 25%, 3/4 = 75%, 1/5 = 20%, 1/10 = 10%. Both numbers in the fraction matter: the bottom number tells you how many equal parts, and the top number tells you how many of them you have.