11 in Roman Numerals
11 written in Roman numeralsXI
11 = XI. Read left to right: X (10) + I (1) = 11.
Going the other way, the Roman numeral XI equals the number 11.
How to write 11 in Roman numerals
- Tens: 10 is X.
- Ones: 1 is I.
- Put them together, largest first: X + I = XI.
XI uses only additive notation: every symbol is the same size or smaller than the one before it, so you simply add them up.
11 is an odd number, a prime number and written with 2 symbols in Roman numerals.
Where you might see XI
- On a clock face, XI marks 11 o'clock.
- In dates written in Roman numerals, XI can stand for the month of November.
- Super Bowl XI was the 11th Super Bowl, played in early 1977.
- Book chapters, outlines, movie sequels and royal names use numerals like XI for the number 11.
Multiples of XI
| Sum | Number | Roman numeral |
|---|---|---|
| 11 × 2 | 22 | XXII |
| 11 × 3 | 33 | XXXIII |
| 11 × 5 | 55 | LV |
| 11 × 10 | 110 | CX |
Numerals near XI
| Number | Roman numeral |
|---|---|
| 6 | VI |
| 7 | VII |
| 8 | VIII |
| 9 | IX |
| 10 | X |
| 11 | XI |
| 12 | XII |
| 13 | XIII |
| 14 | XIV |
| 15 | XV |
| 16 | XVI |
Questions
How do you write 11 in Roman numerals?
11 is written XI.
What number is XI?
XI is 11.