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1000 milliletres = 1 metre so 5208 mm = 5208/1000 m = 5.208 metres.
5 cm = 50 mm which is greater
420 mm is greater than 4.2 cm
680 mm is the same as 68 cm
10 cm is greater than 38.5 mm because 10 cm = 100 mm and 38.5 millimeters = 3.85 centimeters.