Percentage change
Lesson 10 of 11
Finding the percentage change
Objective. Express a change as a percentage of the original amount.
The key idea
Percentage change = change ÷ original × 100. The original amount is always the denominator, not the new one.
Worked example
A price rises from £40 to £46. What is the percentage increase?
- 1Change: 46 − 40 = 6.
- 26 ÷ 40 = 0.15.
- 30.15 × 100 = 15%.
Answer: 15% increase
Practice
Each question comes with a picture and a listen button. Try it first, then reveal the answer.
Common mistake. Dividing by the new amount instead of the original.
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