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)
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99 = IC (-1+100) But today's conversion of 99 into Roman numerals is XCIX However, the Romans themselves would have probably wrote out the number 99 as LXXXXVIIII which then can be simplified to IC
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)
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)
If you mean IC = 100-1 in Roman numerals then its full form is LXXXXVIIII = 99 Note that in todays modern configuration of Roman numerals 99 is now considered to be XCIX
Nowadays we would convert 99 into Roman numerals as XCIX But the ancient Romans probably chose the simpler version of IC