Discussion

Half per cent written as decimal is

Answer: C

Half per cent as a decimal is 0.005.

'Per cent' means 'out of 100', so half per cent is half divided by 100:

\[ \begin{aligned} \tfrac{1}{2}\% &= \frac{0.5}{100} \\ &= 0.005 \end{aligned} \]

0.05 is 5 per cent, 0.02 is 2 per cent and 0.2 is 20 per cent. The usual slip is to write 0.5% as 0.05, forgetting to divide by 100 after halving.

A quick rule: to turn any percentage into a decimal, move the decimal point two places to the left, so 0.5% becomes 0.005.

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