Proportion & Rates
Rates compare two quantities — like miles per hour or grams per cm³.
Direct & inverse proportionSpeed, distance, timeDensityBest buys
📖 Learn
Speed
Speed = distance ÷ time. Cover it in a triangle: D on top, S and T below.
Density
Density = mass ÷ volume (g/cm³).
Inverse
If y is inversely proportional to x, xy stays the same.
Worked example
A car goes 150 km in 2.5 hours. Speed?
- 1Speed = distance ÷ time
- 2150 ÷ 2.5
- 3= 60 km/h ✅
⭐ Practise
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