C = 100
X = 10
I = 1
They are added together each time they occur unless a smaller numeral precedes a larger numeral in which case it is subtracted
→ XCIX = (-10 + 100) + (-1 + 10) = 90 + 9 = 99
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99
The Roman numerals X-XCIX represent 10-99
In todays modern notation of Roman numerals they represent 99
The number 49 in Roman numerals is XLIX and the number 99 in Roman numerals is XCIX
The number 99,989 can be represented by the Roman numerals (XCIX)CMLXXXIX