It is: 99 = LXXXXVIIII later changed to XCIX in the Middle Ages
No, "XCIX" is not the greatest two-digit Roman numeral number. The greatest two-digit Roman numeral number is "XC" which represents 90. "XCIX" represents 99.
1
The number 222 can be represented by the Roman numeral CCXXII
The Roman numeral MCMXXV represents the number 1925.
The number 27 as a Roman numeral is XXVII
The Roman numeral for the number 1973 is MCMLXXIII
The roman numeral CXCIV is the number 194.
Roman numeral MCMLXXX is the number 1980.
The Roman Numeral L is equivalent to the number 50.
No Roman numeral exists for zero.
That is not a valid Roman Numeral.
88, rather nicely uses 8 characters in Roman numerals: LXXXVIII.