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Year 7 · Fractions, Decimals & Percentages

Unit rates and best buys

A unit rate is the cost or amount for one item. Once you know one, you can find any number.

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How to do it

  1. Divide the total by the number of items to find one.
  2. Multiply by the new number of items.

Worked example

10 litres of petrol cost $30. How much is one litre, in dollars?
Divide the total by the number of items: 30 ÷ 10 = 3.
Answer: 3

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