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Year 1 · Measurement

Measure with a ruler (cm)

Units of length come in a chain: 10 mm = 1 cm, 100 cm = 1 m, 1000 m = 1 km.

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How to do it

  1. Decide whether the new unit is bigger or smaller.
  2. Going to a smaller unit: multiply. Going to a bigger unit: divide.
  3. Use 10, 100 or 1000 from the chain.

Worked example

3 m in cm
cm are smaller, so multiply by 100.
3 m = 300 cm

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A bigger unit gives a smaller number.

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