Originally the characters were notches cut into tally (or counting) sticks in the Etruscan (pre-Roman) era. The Romans adopted them for writing on parchment but substituted the letter in their own Roman alphabet which was closest in appearance to the original mark. The C and the M were adopted because they conveniently represented the Latin centum (100) and mille (1000).
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The history of Roman numerals dates back to 1st millennium BC when they were used as to record numbers in stone, art and coins.
89.5 in Roman numerals is LXXXVIIIIS which can be simplified to SXC (100-10.5) Source of information: 'History of Mathematics' by David Eugene Smith.
Roman numerals were inspired by Etruscan numerals of which Roman numerals originated from.
Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.
113 = CXIII in Roman numerals