A millimetre, abbreviated as mm, is a unit of length in the metric system which is commonly used for measuring small distances. One millimetre is equal to one-thousandth of a metre. This means there are 1,000 millimetres in a metre.
Millimetres are often used to measure things that are too small for centimetres, like the thickness of a coin or the width of a pencil.
Understanding millimetres is important in GCSE Maths, especially when working with measurements and conversions in practical situations.
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