2000 dm is the same as 200 m. 2000 dm is longer than 20 m, not bigger.
3 m = 300 cm which makes it bigger than 200 cm
200 dm
dm = decameter 1 dm = 10 m answer: 50 dm
No
500 m
30dm = 300cm = 3m. They're the same.
3000 dm
0.85 m
10 m = 100 dm 100 dm > 78 dm 10 m > 78 dm
10 dm = 1 m so 200 dm = 200/10 = 20 metres. Simple!
They are equivalent.