Question P6 Units and parts
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The ratio of the length to the width of a rectangle is 5 : 2. The perimeter is 84 cm. Find the area of the rectangle.
Answer
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Cut one amount into equal shares. One number tells you what a share is worth.
In this one. The perimeter goes all the way round, so it holds two lengths and two widths — 5 + 2 + 5 + 2 = 14 units, not 7.
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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