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Detailed Month.
decimeter
decimetre, 1/10 or 0.1 of a meter
dm means decimeter - 1/10 of a meter. It is not a very commonly used unit; usually people use meters, centimeters, or millimeters.
Since 1 m = 10 dm, then 1 m 60 dm + 30 dm = 70 dm + 30 dm = 100 dm = 10m or 1 m 60 dm + 30 dm = 1m 90dm = 10 m.