0.9 dm is 9 cm is 90 milimeters
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100 mm in a dm
500 mm = 5 dm
mm is millimeters (thousandths of a meter).dm is decimeter (tenths of a meter).26.1 mm = 0.261 dm
1 dm = 10 cm 0.9 dm = 9 cm = 90 mm
There are 100 mm in a decimeter