Key learning points

1. Ratios are often used to describe converting between metric and imperial measurements.
2. The ratio is either in the simplest form or in unitary form.
3. 5 miles is roughly 8 kilometers, the approximation is to allow for easy mental calculations.

Common misconception

Keywords

• Metric unit - Metric units are based around the standard units of metre, gram and litre.

• Centi- - Centi placed before a unit means 1/100

• Milli- - Milli placed before a unit means 1/1000

• Kilo - Kilo placed before a unit means 1000 times.

• Imperial unit - Imperial is a system of units for measuring, which was created in the early 1800s during the British Empire.