424 in Roman numerals

424 in Roman numerals is CDXXIV.

Pick any whole number from 1 to 3,999.

424 = \text{CDXXIV}

How to work it out

1
Take the biggest Roman value that fits, write its letter, subtract it, and repeat.
2
Here: 400 (CD) + 10 (X) + 10 (X) + 4 (IV) = 424.
3
Joined together: CDXXIV. (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 424 in Roman numerals?

CDXXIV.

How do you read CDXXIV?

CDXXIV = 400 + 10 + 10 + 4 = 424.