10 meters
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10 m = 100 dm 100 dm > 78 dm 10 m > 78 dm
deci- prefix means tenth (1/10) ⇒ 1 dm = 1/10 m ⇒ 10 dm = 1 m ⇒ 1 sq m = 1 m x 1 m = 10 dm x 10 dm = 100 dm2
10 meters = 100 decimeters.
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.
1 m = 10 dm ⇒ 1374 m = 1374 x 10 dm = 13740 dm