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Question P4–P5–P6 Units and parts

Sticker collection — four friends

Four friends collected stickers over the summer. Ana collected 8 fewer stickers than Ben. Cara collected twice as many stickers as Ben. Dee collected 4 fewer stickers than Cara. Together the four friends collected 90 stickers. How many stickers did Dee collect?

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About this method

Units and parts

Cut one amount into equal shares. One number tells you what a share is worth.

In this one. Complete each shortened bar: adding the missing 8 and 4 to the total turns 90 stickers into 6 equal Ben units.

In allone share

How to spot it

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.

Common mistake

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.

Practise a similar question

Standard Four classmates saved money for a class trip. Liam saved $15 less than Sara. Priya saved twice as much as Sara. Tom saved $9 less than Priya. Altogether the four classmates saved $126. How much did Tom save?
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