491 is CDXCI.
CD is 500 - 100.
XC is 100 - 10.
(I is 1.)
491-500: cdxci, cdxcii, cdxciii, cdxciv, cdxcv, cdxcvi, cdxcvii, cdxcviii, cdxcix, d
XDI - D=500, X=10 and I=1... Placing the X before the D means you subtract it from the larger number, then add the 1. Another (longer) way to write it would be CCCLXXXIX (100+100+100+50+10+10+10+9)Additional Information:-In today's notation of Roman numerals 491 is: CDXCIBut the Romans themselves would have worked out 491 as CCCCLXXXXI and then simplified it to XDI (501-10 = 491) which uses less numerals but of equal value
You write 1533 in roman numerals like this: MDXXXIII
To write 19000 in Roman numerals, combine the Roman numerals for 1000 (M) and 9000 (IX). Therefore, 19000 in Roman numerals is written as MXCM.
To write twenty in Roman numerals, you simply write the letter X.
CCCLX is the number 280 in roman numerals. This number is used to represent what roman used to write.
MM is 2000 in Roman numerals.
403 is CDIII in Roman Numerals
3456 in Roman numerals is MMMCDLVI
94 in Roman Numerals is XCIV.
Zero does not exist in roman numerals
576 in Roman numerals is DLXXVI.