Various instruments are used to measure length. For example:
  • Rulers and tape measures are marked in millimetres or centimetres to measure shorter lengths accurately. 
  • A trundle wheel is used to measure length to the nearest metre. Note that a counter may be attached to the trundle wheel to count metres. 
  • A car's odometer often measures distance in tenths of a kilometre.

To convert length from a larger unit into a smaller unit, multiply by the relevant power of 10.
To convert length from a smaller unit into a larger unit, divide by the relevant power of 10.

Convert the following measurements to the units indicated:
a. 7 cm to mm
b. 8 m to cm
c. 9 km to m



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