There are 100 millimeters (mm) in 1 decimeter (dm)
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1dm=10cm=100mm60dm is therefore 6000mm, and longer than 100mm.
1dm = 10 cm 50dm x 10cm/1dm = 500cm
It is 1dm = 10cm
length would be about 1dm, but dms are not used. centimetres would be more mainstream to use