Chapter 10

Ratio and Proportion

Simplifying ratios and sharing amounts in a given ratio, plus proportion problems — with an interactive exercise.

We simplify ratios and share amounts in a given ratio.

A ratio like 6 : 9 can be simplified to 2 : 3. To share 12 sweets in the ratio 1 : 2, there are 1 + 2 = 3 equal parts, so one part = 4: the shares are 4 and 8.

Remember

  • Add the ratio parts, then find the value of one part.
  • 3 : 6 = 1 : 2 (divide both by the same number).

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