6.2 Percentage change — Practise with help
Try each question before opening a hint. Reveal the full working to check your method.
Warm-up: remember
- Work out 20% of 80.
- Write 7% as a decimal multiplier for an increase.
Check your answers
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- 1.07.
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Practise with help
1. Increase 240 by 12%.
Hint
Find the increase multiplier.
Full working
1.12 × 240 = 268.8.
2. A value falls from 80 to 68. Find the percentage decrease.
Hint
Find the change, then divide by the start.
Full working
Change 12; 12 ÷ 80 × 100 = 15%.
3. A £90 bill rises by 4%. Find the new bill.
Hint
Use the multiplier 1.04.
Full working
£90 × 1.04 = £93.60.
Progress check: revisit your savings estimate. What calculation would make it exact?