A millimetre is a thousandth of a metre which is the standard measure of length in the international system (SI) of measurement.
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The metric unit for 1 millimeter is meters. 1 millimeter is equal to 0.001 meters.
Millimeter is the smallest unit among centimeter, kilometer, millimeter, and meter.
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I assume you are referring to millimeter. 0.001 meters = 1 millimeter.
1 decimeter = 100 millimeters. 1 Millimeter = 0.01 decimeters