1 millimetre is 0.000001 kilometres, as there are 1,000,000 millimetres in a kilometre.
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Divide it by 106 (or 1 million).
One million 10^6
There are 1000000 millimeters in one kilometer so that means you have to divide your milliometers by 1000000 [EXAMPLE] 3950000000mm/1000000=3950km
kilometers
The diameter of a penny is approximately 0.75 inches (19.05 millimeters). To convert this measurement to kilometers, we need to first convert inches to meters by multiplying by 0.0254 (since 1 inch is equal to 0.0254 meters). This gives us a diameter of approximately 0.0004826 meters. Finally, to convert meters to kilometers, we divide by 1000, resulting in a diameter of approximately 0.0000004826 kilometers.