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← Further Multiplicative Thinking
Concept · 4 steps · NESA MA4-FRC-C-01

Solving Problems Involving Percentages

Sales, GST, interest, tips — percentages are the maths you'll use more than almost any other. Get the one idea underneath them all and the rest is just dressing.

1Where it comes fromPer cent just means "out of 100". Shade a grid and watch it click. 2How to do it% of an amount, increase/decrease, and one quantity as a % of another. 3Where it gets trickyUp then down ≠ back to start, "% of which whole", and % ↔ decimal. 4Out in the wildDiscounts, GST, interest, tips — and working backwards to the original price.
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