Number · Fractions & decimals
Chapter 1 · 3
The idea
Converting fractions, decimals and percentages
One amount can be written as a fraction, a decimal or a percentage. Why per cent means "out of 100", how to move between the three forms in every direction, how to put a mixed list in order, and how to write one quantity as a fraction or a percentage of another, including answers bigger than 100%.
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Number · Fractions & decimals
Converting fractions, decimals and percentages
One amount can be written as a fraction, a decimal or a percentage. Why per cent means "out of 100", how to move between the three forms in every direction, how to put a mixed list in order, and how to write one quantity as a fraction or a percentage of another, including answers bigger than 100%.
Why it works
One score, four ways of writing it
Four netball players practise shooting. Each takes a different number of shots and reports the result a different way. Amir scores out of . Bea scores . Cal's success rate is . Dina scores of her shots. Who is the best shooter?The four numbers cannot be compared yet: they are written four ways. The key fact is that per cent means per hundred, so is out of every . Cut each of Amir's squares into , and his score becomes a number out of .
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