1000 m = 1 km so 4500 m = 4.5 km. Simple!
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10 millimeters = 1 centimeter 10 centi meters = 1 decimeter 10 decimeters = 1 meter 10 meters = 1 decameter 10 decameters = 1 hectometer 10 hectometers = 1 kilometer .......now 1000m =1 km then 4500m = 4.5 km
600 km.600 km.600 km.600 km.
0.1 km is 1/10 as a fraction
It is 0.004 km.
0.375 square km.