404 in Roman numerals

404 in Roman numerals is CDIV.

Pick any whole number from 1 to 3,999.

404 = \text{CDIV}

How to work it out

1
Take the biggest Roman value that fits, write its letter, subtract it, and repeat.
2
Here: 400 (CD) + 4 (IV) = 404.
3
Joined together: CDIV. (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.)

Value	Letters
400	CD
4	IV

What is 404 in Roman numerals?

CDIV.

How do you read CDIV?

CDIV = 400 + 4 = 404.