121 in Roman numerals

121 in Roman numerals is CXXI.

Pick any whole number from 1 to 3,999.

121 = \text{CXXI}

How to work it out

1
Take the biggest Roman value that fits, write its letter, subtract it, and repeat.
2
Here: 100 (C) + 10 (X) + 10 (X) + 1 (I) = 121.
3
Joined together: CXXI. (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 121 in Roman numerals?

CXXI.

How do you read CXXI?

CXXI = 100 + 10 + 10 + 1 = 121.