Nowadays we would convert 99 into Roman numerals as XCIX
But the ancient Romans probably chose the simpler version of IC
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The number 49 in Roman numerals is XLIX and the number 99 in Roman numerals is XCIX
The above numbers converted into Roman numerals are IX, XC, M, CM and XI respectively and the Romans would have probably added them up in the following fashion:- IX+XC = IC IC+M = IMC IMC+CM = IMM IMM+XI = MMX Hindu-Arabic conversion:- 9+90 = 99 99+1000 = 1099 1099+900 = 1999 1999+11 = 2010 For more complicated calculations the Romans would have used an abacus counting device.
In todays modern notation of Roman numerals they represent 99
99
99+1056 = 1155 or MCLV in Roman numerals Today we write out 99 in Roman numerals as XCIX but the Romans themselves would have probably wrote it out simply as IC (-1+100 = 99)