109 in Roman numerals

109 in Roman numerals is CIX.

Pick any whole number from 1 to 3,999.

109 = \text{CIX}

How to work it out

1
Take the biggest Roman value that fits, write its letter, subtract it, and repeat.
2
Here: 100 (C) + 9 (IX) = 109.
3
Joined together: CIX. (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
100	C
9	IX

What is 109 in Roman numerals?

CIX.

How do you read CIX?

CIX = 100 + 9 = 109.