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 twenty in Roman numerals, you simply write the letter X.
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.
CCCLX is the number 280 in roman numerals. This number is used to represent what roman used to write.
507 in roman numerals is DVII
109 in Roman numerals is CIX.
453 in Roman numerals is CDLIII.
4921in Roman numerals MMMMCMXXI.
662 in Roman numerals is DCXII
627 in roman numerals: DCXXVII