How is "93" written in Roman numerals?

The equivalent of the number 93 in Roman numerals is XCIII. The Roman numeral system uses letters instead of numbers. The basic Roman numerals up through 100 are as follows: I equals one, V equals five, X equals 10, L equals 50 and C equals 100.

No more than three of a single letter is allowed in succession. Numbers are figured in the Roman numeral system by adding and subtracting from the basic units. In the number 93, 90 is written as XC, which means 100 minus 10, and three is written as III. When a letter denoting a smaller number appears to the left of a letter corresponding with a larger number, the smaller number is subtracted from the larger one.