1000 = M
2000 = MM
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2000 (1000+1000=2000)
2000 = MM In Roman Numerals M = 1000 So 2000 becomes 1000 + 1000 = M + M written as 'MM'.
Well, darling, MCCM in Roman numerals is 2200. So, if you were planning on impressing someone with your knowledge of ancient numerical systems, there you go. You're welcome.
2001 in Roman numerals is MMI. M = 1000; I = 1. M + M = 1000 + 1000 = 2000. I = 1; 2000 + 1 = 2001.
It means: MM = 1000+1000 => 2000