1m = 1/1000 km
0.03 m = 0.03/1000 =0.00003 km
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1 km equals 100,000 mm
45000 mm is equal to 0.045 km. You can convert mm to km by dividing by 1,000 to move three decimal places to the left.
There are 250,000 mm in 0.25 km.
There are 1,000,000 (one million) mm in a km. Well you see, there are 100 metres in a kilometre. There are 100 centimetres in a metre. There are 10 millimetres in a centimetre. So, 100 times 100 times 10 equals how many mm in a km. That is 1,000,000 mm in a km!
There are 6,000,000 mm in 6 km.