Children extend their investigation of the units used to measure area in the metric system of measurement to (square decametres) hectares (square hectometres) and square kilometres, identifying that the units to measure length have been turned into squares by extending into another dimension.
They estimate, measure and record area in square centimetres, square metres, hectares and square kilometres, recognising that square centimetres, square metres, hectares and square kilometres need not be a square.
Children compare the metric system and the imperial system of measurement, investigating their histories and uses, their units of measurement for area and their respective multiplicative systems.