Percentage change
Lesson 9 of 11
Percentage multipliers
Objective. Increase or decrease an amount using a single multiplier.
The key idea
An increase of 15% multiplies by 1.15; a decrease of 15% multiplies by 0.85. One multiplication replaces find-then-add.
Worked example
Increase £240 by 15%.
- 1Multiplier for +15% is 1.15.
- 2240 × 1.15 = 276.
Answer: £276
Practice
Each question comes with a picture and a listen button. Try it first, then reveal the answer.
Common mistake. Using 1.15 for a decrease or 0.15 for an increase.
Your progress
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