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0.1km. 1hm is 100m, 1km is 1000m
In the metric system 10mm = 1cm, 10cm = 1dm, 10dm = 1m, 10m =1Hm, 10Hm = 1 Dm, 10Dm = 1 Km. therefore 50cm X 10 = 500mm
1hm = 100m and 1m = 10dcm, so 1hm = 100*10dcm = 1000dcm
2.56 km + 8420 m = 22.56 km + 8.42 km = 30.98 km
4 km + 350 km = 354 km = 350,000 metres