- 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.

__Example.__Convert the following measurements to the units indicated:

a. 7 cm to mm

b. 8 m to cm

c. 9 km to m

**Solution:**
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