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Because it's a small unit - there are 10 mm in 1 cm and just over 25 mm in 1 inch. If you were to measure the width of a postage stamp in centimetres, you would probably have to use decimal fractions (2.4 cm); in inches, you might use common fractions (15/16 inch).

If you use millimetres, you can use whole numbers (24 mm). Also, metric measurement is internationally understood.

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12y ago

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What is a tenth of a millimeter?

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