The centi- (c) prefix means one hundredth (1/100)
The deci- (d) prefix means one tenth (1/10)
→ 1 dm = 1/10 m = 10/100 m = 10 × 1/100 m = 10 cm
→ 456 dm = 456 × 10 cm = 4560 cm
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1 dm = 1 cm → 1 dm² = 1 dm × 1 dm = 10 cm × 10 cm = 100 cm² → To convert dm² to cm² multiply by 100 → 5 dm² = 5 × 100 cm² = 500 cm².
5 dm. 1 dm is 10 cm.
1 dm = 10 cmso, (1 dm)2 = (10 cm)2 = 100 cm2
As 1 dm = 100 mm and as 1 cm = 10 mm there are 0.1 dm in 1 cm
There are 10 cm in a dm and so a decimeter is 1/10 of a meter