No - one decimetre is equal to 100 millimetres exactly.
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1dm=10cm=100mm60dm is therefore 6000mm, and longer than 100mm.
No 1dm=10cm.
100 metres is equal to 1000 millimetres - ten times more than 100 millimetres.
1dm = 10 cm 50dm x 10cm/1dm = 500cm
100mm is 10cm