Convert between units of measure, including using common decimals and fractions

What this means, in plain words

A decimal writes parts of a whole using the places after the point: tenths, then hundredths, then thousandths.

Converting means saying the same amount in a different unit, such as 1,500 metres as 1.5 kilometres.

A fraction describes part of a whole, or part of a set, once the whole has been split into equal pieces.