There are **1,000,000 micrometres (µm)** in a millimeter.
If you meant "micrometres" instead of "mitres," readmore...
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There are 1,000mm in a metre. This means that 1mm is a thousadnth of a metre, which can be written numerically as 0.001m
But, what are the units of 40x20? Centimetres, millimetres, mitres or kilometres?
There are no centimeter's in a millimeter.
One millimeter is 0.000001km
1 kilometer = 1000000 millimeter
There are 1,000 micrometers in one millimeter.