90 = XC
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The number 90 is represented by the Roman numeral XC
XC = 90
The equivalent of 90 as a Roman numeral is XC or LXXXX
21 in Roman numerals is XXI. 1 in Roman numerals is I. 90 in Roman numerals is XC. So, 21 1 90 would be XXI I XC in Roman numerals.
90 = XC