In my local newspaper weather section it says they are the same but I don't think they are. I'm sure 10cm = 1mm
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680 mm is the same as 68 cm
1 cm = 10 mm 120 cm = 1200 mm so 120 cm and 1200 mm is equal
mm and cm are not the same unit in math because cm are a bit bigger :D
There are ten mm in a cm. These two are the same distance.
they are both the same 1 cm = 10 mm 5 cm = 50 mm