4.9dkm=49km
49km=49000 m
1m=10dm
therfore
4.9dkm=490,000 dm
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1 km = 100 dkm.
how many dkm in .4 km
The 'D' is an older version of 'da' (the SI standard) and means "Deca" or 10 so 1 Dkm = 1 dakm = 10 km
7m.........dm
dm = decameter 1 dm = 10 m answer: 50 dm