A decimal is a pure number. A millimetre is a unit of length. There is no equivalence between the two.
1 mm is equal to 1.0 mm or 1.00 mm or 0.001 metre or lots of other possibilities. But all of them are measures of length, not decimals.
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1.000 millimeter (as many zeros as you want after the decimal point)
In decimal form, 5 hundredths of a millimeter can be written in the form .05 mm.
1 micrometer = .001 millimeter 1000 micrometers in one millimeter (mm) = 10^-3 (um) = 10^-6
Since a millimeter is one tenth of a centimeter, just move your decimal to the right. So, 41.9 centimeters is equal to 419 millimeters.
1/1000