Metric unit conversion

Converting between mm, cm, m and km, mg, g, kg and tonnes, and ml and litres.

Comparing quantities in different units

Ordering and adding quantities by converting to a common unit first.

Money: pounds and pence

Converting pounds to pence, and writing money to exactly two decimal places.

Currency conversion

Converting between pounds and euros at a given rate, and back again.

Area and volume unit conversion

Why the linear factor is squared for area and cubed for volume.

Volume and capacity

Linking cubic centimetres to millilitres and cubic metres to litres.

Metric and imperial conversion

Approximate equivalences for miles, pounds, pints and inches.