Under today's rules it is written as XCIX
But under the Roman rules 99 was once written as LXXXXVIIII which can be methodically modified to IC (100-1)
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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)
The number 49 in Roman numerals is XLIX and the number 99 in Roman numerals is XCIX
Today's conventional way of writing 99 into Roman numerals is XCIX. However the Romans themselves would have probably calculated 99 on a abacus counting device as LXXXXVIIII and then wrote it out as IC (-1+100 =99)
In todays modern notation of Roman numerals they represent 99
99