990 but today's way of writing it in Roman numerals is CMXC although the Romans themselves would have probably wrote it out as XM (-10+1000 = 990)
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XM would be 990. There is no Roman Numeral U. There is a V. V is five, but 995 would be VM, not XMV.
Roman Numeral for: 10000= X with horizontal bar above it 1000=M Therefore: ............_ 11000= XM
CMXC It could be written as XM, but that is not considered correct today.
XM = 1000 - 10 = 990 NB X = 10 M = 1000 When a smaller value letter appears to the LEFT of a larger value letter, it means subtract.
The numeral XMCMV is not a Roman numeral as it does not follow te rules for wrting numerals. X (10) should never preceed any numeral of a higher value than C (100). If te numeral XMCMV did exist it might be supposed to have a value of XM (990) + CM = (900) + V (5) which would equal 1895 but the correct Roman numeral for 1895 is MDCCCXCV