13 in Roman Numerals
13 written in Roman numeralsXIII
13 = XIII. Read left to right: X (10) + III (3) = 13.
Going the other way, the Roman numeral XIII equals the number 13.
How to write 13 in Roman numerals
- Tens: 10 is X.
- Ones: 3 is III.
- Put them together, largest first: X + III = XIII.
XIII uses only additive notation: every symbol is the same size or smaller than the one before it, so you simply add them up.
13 is an odd number, a prime number and written with 4 symbols in Roman numerals.
Where you might see XIII
- In dates written in Roman numerals, XIII can stand for day 13 of the month.
- Super Bowl XIII was the 13th Super Bowl, played in early 1979.
- Book chapters, outlines, movie sequels and royal names use numerals like XIII for the number 13.
Multiples of XIII
| Sum | Number | Roman numeral |
|---|---|---|
| 13 × 2 | 26 | XXVI |
| 13 × 3 | 39 | XXXIX |
| 13 × 5 | 65 | LXV |
| 13 × 10 | 130 | CXXX |
Numerals near XIII
| Number | Roman numeral |
|---|---|
| 8 | VIII |
| 9 | IX |
| 10 | X |
| 11 | XI |
| 12 | XII |
| 13 | XIII |
| 14 | XIV |
| 15 | XV |
| 16 | XVI |
| 17 | XVII |
| 18 | XVIII |
Questions
How do you write 13 in Roman numerals?
13 is written XIII.
What number is XIII?
XIII is 13.