Brainlag PlusPercentages of amounts with and without a calculator, increases and decreases with multipliers, percentage change and simple interest.
Building blocks, and multipliers
Without a calculator, build from 10% (divide by 10) and 1% (divide by 100).
35% of £240: 10% = £24, so 30% = £72, 5% = £12, 35% = £84.
With a calculator, use a multiplier:
- 17.5% of an amount: × 0.175
- increase by 8%: × 1.08 (100% + 8%)
- decrease by 15%: × 0.85 (100% − 15%)
The rest of this lesson and its 7 practice questions are in Plus.
Screen 1 of 3, free to read.
- 7 exam-style questions, marked as you go, each with a worked solution
- The Fraction Calculator beside every question
- Anything you get wrong is saved to your flashcards