Question P4–P5–P6 Units and parts
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A tank was full. After removing 15 litres, it was full. What is the capacity of the tank?
Answer
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Cut one amount into equal shares. One number tells you what a share is worth.
In this one. Write both fillings in the same fraction — 1/2 is 2/4 — and the 15 litres stops being a mystery: it is the gap between 3/4 and 2/4, one quarter of the whole tank.
A single amount is split by a ratio, a fraction or a percentage. One extra number gives you the leftover, the difference, or the value of one share.
Children match the given number to the wrong number of shares, using the whole bar when the number covers only the leftover or the difference between two people's shares.
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