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GCSE Mathematics · key term
A unit formed by combining two or more units, usually through multiplication or division, such as kilometres per hour or kilograms per cubic metre.
Used by AQA and Edexcel
Specification N13, R1, R11 · Paper 1, Paper 2, Paper 3
A unit formed by combining two or more units, usually to express one quantity per unit of another, such as kilometres per hour.
A unit formed by combining two or more standard units, usually to describe one quantity per unit of another.
Read “per” as division and include the complete compound unit in the answer.
Write the compound unit with every answer, such as km/h, £/kg, g/cm³ or N/m².
Before comparing rates, convert them to the same compound unit. Comparing the numerical values alone can give the wrong conclusion.
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Specification R1, R11 · Paper 1, Paper 2, Paper 3
A unit formed from two or more units, usually connected by multiplication or division, such as metres per second or kilograms per cubic metre.
Revise: Units and Compound UnitsA compound unit combines units. The word “per” means “for each” and is represented by division.
A measurement formed by combining two or more different units, usually by multiplication or division, such as kilometres per hour or grams per cubic centimetre.