Proportion
Direct: double one, double the other. Inverse: double one, halve the other.
Understanding proportionConversion graphsConverting unitsDirect proportionBest buysInverse proportion
📖 Learn
Unitary method
Find the cost of ONE, then multiply.
Best buy
Compare price per item (or per gram).
Inverse
More workers → less time. Workers × time stays the same.
Worked example
5 pens cost £3. Cost of 8?
- 11 pen = 3 ÷ 5 = £0.60
- 28 × 0.60
- 3= £4.80 ✅
⭐ Practise
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