MCM
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MCM = 1900
1900- MCM This is the reason 1900 is MCM in Roman numerals; M represents 1000 and CM represents 900.
That is not a correct Roman Numeral. If it is MMV it would be 2005. If it is MCM it would be 1900.
MCM stands for 1900. M is 1000. C is 100. Because a smaller lies before a bigger roman numeral you must substract. So 1000 + (1000-100) = 1900 or MCM.
The numeral MCMCXC is not a correctly written Roman numeral. MCM = 1900 and CXC = 190. However 1900 + 190 = 2009 and the correct Roman numeral for this date would be MMIX.