XC is the usual convention (X =10 subtracted from C = 100).
More rarely seen is LXXXX (L=50 and XXXX = 40)
Chat with our AI personalities
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.
It is: XLL = XC = 90
90 = XC
XC = 90
xviiivlxxix = 90