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Numbers, units and arithmetic
Numbers, units and arithmetic

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2 Units of measurement

Numbers are used to count things (such as 54 sheep in a field) or, together with units of measurement, to quantify something (such as a 2-litre water bottle or a 3-year waiting list for an operation). This section reminds you of some units of measurement and considers appropriate units to use. We also need to make comparisons between quantities given in different units.