Question P4–P5–P6 Units and parts
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Four stalls at a charity bake sale sold cupcakes. Stall B sold 6 fewer cupcakes than Stall A. Stall C sold 3 times as many cupcakes as Stall A. Stall D sold 9 fewer cupcakes than Stall C. Altogether the four stalls sold 145 cupcakes. How many cupcakes did Stall D sell?
Answer
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Cut one amount into equal shares. One number tells you what a share is worth.
In this one. Make Stall A one unit, then restore the two missing amounts, 6 and 9, so the ragged total becomes 8 complete equal units.
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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