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1 dm = 10 cm so 7.5 dm/90 cm = 75 cm / 9 cm = 75/9 = 25/3
The centi- prefix means one hundredth → 1 cm = 0.01 cm The deci- prefix means one tenth → 1 dm = 0.1 cm → 25 cm : 9 dm = 25 × 0.01 m : 9 × 0.1 m = 0.25 m : 0.9 m = 0.25 : 0.9 = 25 : 90 The radio of 25cm to 9 dm is 25:90
1 dm = 10 cm, so the ratio is 45:70 or 9:14
2.5 dm
5
It is 3 to 5 because 5 dm = 50 cm
since 1 dm is 10 cm, there are 25 cm in 2.5 dm.
121 cm:77 dm = 121 cm:770 cm = 121:770 which cannot be simplified.
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.
1 dm = 10 cm 200 dm = 2000 cm
No 1 dm = 10 cm
10 cm in 1 dm