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Year 8 · Fractions, Decimals & Percentages

Direct proportion problems

Two quantities are in proportion when one is always the same multiple of the other.

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How to do it

  1. Find what one unit is worth.
  2. Multiply up to the number you need.
  3. For x/a = b/c, cross-multiply.

Worked example

A cyclist rides 2 km in 14 minutes. At the same speed, how many minutes for 4 km?
Find one first: 14 ÷ 2 = 7. Then 7 × 4 = 28.
Answer: 28

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