120 in Roman numerals

120 in Roman numerals is CXX.

Pick any whole number from 1 to 3,999.

120 = \text{CXX}

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) = 120.
3
Joined together: CXX. (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 120 in Roman numerals?

CXX.

How do you read CXX?

CXX = 100 + 10 + 10 = 120.