Compound measures
Lesson 8 of 9
Density and mass
Objective. Use density = mass ÷ volume in both directions.
The key idea
Density tells you the mass of each unit of volume. Mass = density × volume, and volume = mass ÷ density.
Worked example
A block has volume 20 cm³ and density 7 g/cm³. Find its mass.
- 1Mass = density × volume.
- 27 × 20 = 140.
Answer: 140 g
Practice
Each question comes with a picture and a listen button. Try it first, then reveal the answer.
Common mistake. Dividing volume by mass because the formula was recalled upside down.
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