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To convert a fraction or a decimal to a percentage, multiply the fraction or the decimal by 100.
Example:
Express these fractions as percentages:
(i) \( \frac{1}{5} \)
(ii) \( \frac{125}{400} \)
(iii) \( \frac{2}{5} \)
Solution
(i) \( \frac{1}{5} \\ = \frac{1}{5} \scriptsize \: \times \: 100 \% \\ = \scriptsize 20 \% \)
(ii) \( \frac{125}{400} \\ = \frac{125}{400} \scriptsize \: \times \: 100 \% \\ =\frac{125}{4} \\ = \scriptsize 31.25 \% \)
(iii) \( \frac{2}{5} \\ = \frac{2}{5} \scriptsize \: \times \: 100 \% \\ = \scriptsize 2 \: \times \: 20 \% \\ = \scriptsize 40 \% \)
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