There is a direct proportion between two values when one is a multiple of the other. For example, \(1\text{cm} = 10\text{mm}.\) To convert \(\text{cm}\) to \(\text{mm}\), the multiplier is always 10.

Save guides, add subjects and pick up where you left off with your BBC account. Before reading this guide, it may be helpful to read the guide from Module 7 (M7) about proportion and variation. Module ...