Question Units and parts
Shanice used the same amount of shampoo each day. After 7 days, of the bottle was left; after 15 days, 280 ml was left. Find the amount at first.
Answer
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Cut one amount into equal shares. One number tells you what a share is worth.
In this one. If 7 equal daily amounts use 1/5 of the bottle, the whole bottle contains 5 groups of 7, or 35 equal daily-use 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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