The Metric System


commonly used metric units:

weight: milligram (mg), gram (g) and kilogram (kg)

length: millimetre (mm), centimetre (cm), metre(m) and kilometre (km)

capacity: litre (l) and millilitre (ml)

the basic unit for time in the metric system is seconds.

Key Skills

  • change from one commonly used metric unit to another e.g. mm into cm
  • approximate weights, lengths and capacities of everyday objects using metric units.


masscapacitygramtonne, litre.