KS3 Percentages
KS3
Free lesson
Number
Percentages
Percentage Increase & Decrease (No Calculator) — KS3 Maths
A clear, step-by-step KS3 lesson on percentage increase and decrease. Find the percentage, then add it on or take it off — with a bar model and sale-price examples, no calculator needed.
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A coat is 20% off; a salary goes up 15%. Working out the new amount is just two steps: find the percentage of the amount, then add it on for an increase or take it off for a decrease. This lesson uses a bar model to show that a 30% increase gives 130% of the original and a 20% decrease gives 80%, and works through three examples including a sale price — all without a calculator.
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A free printable worksheet with 16 questions and a full worked answer key. No sign-up needed.