11 in Roman numerals

11 in Roman numerals is XI.

Pick any whole number from 1 to 3,999.

11 = \text{XI}

How to work it out

1
Take the biggest Roman value that fits, write its letter, subtract it, and repeat.
2
Here: 10 (X) + 1 (I) = 11.
3
Joined together: XI. (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
10	X
1	I

What is 11 in Roman numerals?

XI.

How do you read XI?

XI = 10 + 1 = 11.