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The problem here is that you don't know what cm and mm are.

cm is centimetre, which is one-hundredth of a metre

mm is millimetre, which is one-thousandth of a metre

The world outside the USA spells metre differently from, for example, a parking meter, because they are completely different. Americans spell metre "meter" good luck with that.

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mebba

Lvl 4
4y ago

What else can I help you with?