Inverse Proportion

More workers, less time

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Inverse proportion: $xy = k$, or $y = k/x$.
• Double one quantity and the other halves; the graph is a hyperbola.
• Work problems: find the total work (e.g. painter-days), then divide.

Steps

1. When one goes up, the other goes down
2. A journey of 120 km
3. Painting a fence
4. Spot the type
5. A faster drive
6. Faster pumps