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If the amounts are measured in different units you may wish to convert them to the same unit. This may not always be desirable or practical (see below). Then you just divide one of the amounts by the other. If the measurement units are the same then the ratio is a pure number. If not, it has a derived unit of measurement.

For example,

  • 240 km in 3 hours is 240/3 = 80 km per hour. You cannot convert these to the same measurement unit.
  • a map in which 1 cm represents 2 km has a scale of 1/2 cm per km or 1 cm to 200000 cm. Since the latter is now in the same units, it can be written simply as 1:200000.
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9y ago
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Q: How do you work out ratio of amounts?
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