GCSE Maths (Edexcel)

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Converting to & from Prefixed Units

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Geometry and Measures Mensuration and Calculation

Converting to & from Prefixed Units

5:29 Converting Units
Spec R1
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  • To convert a measurement from non-prefixed units to prefixed units, divide the measurement by the value that the prefix represents.
  • To convert a measurement from prefixed units to non-prefixed units, multiply the measurement by the value that the prefix represents.
  • To convert prefixed units to other prefixed units, take into account both prefixes.
  • One meter is 0.001 kilometers.
  • One kilogram is 1000 grams.
  • To convert 50 millimeters to kilometers, first convert to meters by multiplying by 1/1000, then divide by 1000 to get the answer in kilometers.
  • It's important to check your calculation by considering if the final value should be larger or smaller than the initial value.
  • Example: 25,000 meters is 25 kilometers.
  • Example: 50,000 milligrams is 0.05 kilograms.

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