Inverse proportion
Learn Inverse proportion for Years 9–11 pupils (ages 13–16). Free practice questions, lessons and worked examples — aligned to the UK National Curriculum.
What you'll learn
- 1
In inverse proportion, as one quantity increases the other decreases — and their PRODUCT stays constant.
- 2
If 4 workers take 6 days, the total work is 4 × 6 = 24 worker-days. With 8 workers: 24 ÷ 8 = 3 days.
- 3
In inverse proportion, what stays the same?
- 4
Not everything that decreases is inverse proportion. Check whether the product really is constant.
- 5
A journey takes 3 hours at 40 mph. Distance = 120 miles. At 60 mph: 120 ÷ 60 = 2 hours.
- 6
6 taps fill a tank in 20 minutes. How long would 12 taps take?
- 7
What shape is a graph of inverse proportion?
Practise Inverse proportion with Whizlo
Free AI-tutored lessons, unlimited practice questions, and progress tracking for ages 13–16. Aligned to the UK National Curriculum.