You can make any number from 1 to 3999 using the following Roman numerals in different combinations. I (1), V (5), X (10), L (50), C (100), D (500) and M (1000). For example; 7 = VII, 23 = XXIII, 276 = CCLXXVI, 1966 would be MCMLXVI, 1555 would me MDLV, 1888 would be MDCCCLXXXVIII, 666 would be DCLXVI and 3999 would be MMMCMXCIX.
MCMLXXXV
DCCLXXIII
MM
XXXII = 32
XXXIII
DCLXVIII = 668
It is: cmxx or CMXX = 920
It is M which means 1000
91 in Roman numerals is XCI (-10+101=91)
As Roman numerals they are: III, XXVIII and II respectively
I,II,III,IV,V,VI,VII,VIII,IX,X
On Converting between Arabic and Roman Numbers ,we get : LX in roman numerals is : 60