1000 millimetres = 1 metre so 200 m = 200/1000 = 0.2 metres. Simple!
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There are 1000mm in 1 meter. So there are 2000mm in 2 meters. You have to divide 200mm by 2000mm to get the fraction. So the fraction is 1/10.
200mm = 20cm
25cm is longer than 200mm which equals 20cm
1m= 1000mm so 1000/200 = 5 times
2dm