429 in Roman numerals

429 in Roman numerals is CDXXIX.

Pick any whole number from 1 to 3,999.

429 = \text{CDXXIX}

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) + 9 (IX) = 429.
3
Joined together: CDXXIX. (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 429 in Roman numerals?

CDXXIX.

How do you read CDXXIX?

CDXXIX = 400 + 10 + 10 + 9 = 429.