- Percentage decrease = finding a new amount after subtracting a percentage
- Multiplier method = 1 - (percentage ÷ 100)
- New amount = Original amount × Multiplier
- Common examples: discounts, depreciation, population decline, weight loss
- Multiplier < 1 always (because we're taking away from the original)
This key facts covers Key Facts: Percentage Decrease within Percentage Decrease for GCSE Mathematics. Revise Percentage Decrease in Ratio & Proportion for GCSE Mathematics with 12 exam-style questions and 22 flashcards. Use this page as part of a wider topic revision path rather than treating it as an isolated fact. It is section 2 of 6 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for Percentage Decrease
What multiplier is used to decrease a value by 35%?
A shop advertises '25% off everything'. A student says: 'The multiplier is 0.25 because 25% = 0.25.' Explain what is wrong with the student's reasoning and state the correct multiplier.
Quick recall flashcards
What is the multiplier for a 10% decrease?
0.90 (because 1 - 0.10 = 0.90)
What is a percentage decrease?
Finding a new amount after subtracting a percentage from the original amount