There are one million (10x100x1000) millimetres in a kilometre.
1 kilometre is 1,000 metres. 1 metre is 1,000 millimetres 1 kilometre is 1,000,000 millimetres.
1.000.000
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1/10 of a kilometer is 1 hectometer.
1 kilometer=100000 centimeters
1 kilometer = 10 hectometers
0.001 kilometers = 1 meter. 1/1000 of a kilometer
1 meter=100centermetres 1centremetre=10 millimetres