Because after 99 comes a hundred which is a 3 digit number.
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The greatest two-digit odd number is 99. In a two-digit number, the first digit can range from 1 to 9, and the second digit can range from 0 to 9. Since we are looking for an odd number, the second digit must be odd, limiting our options to 1, 3, 5, 7, or 9. Among these, 99 is the greatest possible two-digit odd number.
Odd The answer is 99
Odd: it is 99.
ICIX is not used; if it were that is 99 (IC) +9 (IX) = 108 which is not a 2 digit number 99 is the maximum two digit number; in Roman Numerals, that is XCIX
99