491 in Roman numerals

491 in Roman numerals is CDXCI.

Pick any whole number from 1 to 3,999.

491 = \text{CDXCI}

How to work it out

1
Take the biggest Roman value that fits, write its letter, subtract it, and repeat.
2
Here: 400 (CD) + 90 (XC) + 1 (I) = 491.
3
Joined together: CDXCI. (Four of the same letter in a row is never used: 4 is IV, 9 is IX, 40 is XL, 90 is XC, 400 is CD, 900 is CM.)

What is 491 in Roman numerals?

CDXCI.

How do you read CDXCI?

CDXCI = 400 + 90 + 1 = 491.