GCSE Maths (AQA)

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Compound Unit Conversions

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Geometry and Measures Mensuration and Calculation

Compound Unit Conversions

4:01 Converting Units
Spec R1
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  • Compound units are made up of two or more other units
  • To convert a compound unit, each of the units that make up the compound unit must be converted separately
  • One kilometer is equal to a thousand meters
  • One hour is equal to three thousand six hundred seconds
  • Once the units have been converted separately, the conversions need to be combined in the same way as the individual units
  • One kilometer per hour can be thought of as one kilometer divided by an hour
  • A kilometer is a thousand meters and an hour is three thousand six hundred seconds
  • One kilometer per hour is equal to 0.278 meters per second to three significant figures
  • Converting kilometers per hour and meters per second is the most common compound unit conversion
  • You may be asked to convert any given compound units in exams
  • Example question: Calculate 500 meters per second to kilometers per hour
  • Step 1: Convert each unit of the compound unit separately
  • Step 2: Combine each conversion and multiply by the original value
  • Final answer: 1800 kilometers per hour

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