How to write 11 in Roman numerals
Roman numerals are built place by place, from the largest value to the smallest. For 11 the places are 10 (tens), 1 (ones).
- Write 10 as
X. - Write 1 as
I.
Joined together, X + I gives XI.
11 digit by digit
| Place | Value | Numeral | Rule used |
|---|---|---|---|
| tens | 10 | X | one symbol |
| ones | 1 | I | one symbol |
Check XI by reading it back
Reading XI from left to right and adding the pieces: X = 10, I = 1. Together that is 10 + 1 = 11, so XI and 11 match.
Mistakes to avoid with XI
- Only I, X and C may be placed before a larger symbol to subtract, so XI never contains forms such as VX or LC.
- Read XI as one number, not letter by letter: add the values left to right, except where a smaller symbol sits before a larger one.
Facts about the number 11
- 11 is an odd number and a prime number.
- In binary 11 is
1011and in hexadecimal it isB. - Written out, 11 is "eleven".
- The digits of 11 add up to 2.
Where you will see 11 in Roman numerals
The number 11 appears as XI on clock faces just before the noon or midnight mark. Monarchs occasionally carry it when many rulers share a name. Clockmakers use these two strokes plus a cross to maintain the traditional counting system established centuries ago across Europe.
Numbers near 11
FAQ
What is 11 in Roman numerals?
11 is written XI in Roman numerals. It is built from X (10), I (1).
How do you write 11 in lowercase Roman numerals?
Lowercase Roman numerals use the same rules, so 11 is xi. Lowercase is common for page numbers in a book's preface and for outline levels.
How do I convert any number to Roman numerals?
Split the number into thousands, hundreds, tens and ones, write each part with the symbols I, V, X, L, C, D and M, then join them from largest to smallest. Or paste it into the Roman numeral converter, which also converts back.
More roman numerals
- 10 (X): previous page
- 12 (XII): next page
- Roman numerals chart: the full list