1 millimetre = 0.000001 kilometres.
Start with 1 mm. There are 10 millimetres to a centimetre, so divide 1 by 10. Answer is 0.1 cm. There are 100 centimetres in a metre, so divide answer by 100. Answer is 0.001 m. There are 1000 metres in a kilometre, so divide last answer by 1000. Answer is 0.000001 km.
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Divide it by 106 (or 1 million).
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.
1 foot = 304.8 millimeters
1 millimetre is 0.000001 kilometres, as there are 1,000,000 millimetres in a kilometre.
One million 10^6