A gram is a unit of mass. A millimetre is a unit of distance. The two units are therefore incompatible.
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One millimeter is 0.000001km
Either the answer is 1, or this is a trick question!
0.01
There are 1,000 micrometers in one millimeter.
There are one million millimeters in a kilometer, so a millimeter would represent one millionth of a kilometer.