17 in Roman numerals at a glance
- Roman numeral
- XVII
- Lowercase
- xvii
- Letters
- 4
- Parts
- X · V · I · I
- Subtractive pairs
- None
- In words
- seventeen
- Latin name
- septendecim
How XVII is built
Roman numerals are written one decimal place at a time, from the largest place to the smallest. Converting each digit of 17 separately and joining the pieces gives XVII:
| Place | Digit | Value | Numeral |
|---|---|---|---|
| Tens | 1 | 10 | X |
| Ones | 7 | 7 | VII |
Reading it back, left to right:
- X = 10 → running total 10
- V = 5 → running total 15
- I = 1 → running total 16
- I = 1 → running total 17
The rules XVII follows
- Largest to smallest. XVII uses the symbols X, V and I (4 characters in all), and the values never increase from left to right except inside a subtractive pair.
- No subtraction needed. None of the digits of 17 is a 4 or a 9, so XVII is purely additive: just add the symbol values.
- Repetition. II repeats I two times. I, X, C and M may repeat up to three times in a row; V, L and D never repeat.
Where you will see XVII
- The U.S. Constitution. Amendments are often cited in Roman numerals: Amendment XVII provides for the direct election of senators (ratified in 1913).
- The modern Summer Games. They are officially numbered by Olympiad; the Games of the XVII Olympiad belong to 1960: Rome.
- Championship games. Pro football numbers its championship game with Roman numerals, starting from game I in January 1967. Game XVII was played in early 1983.
- Lists and outlines. Book chapters, acts of a play, outline headings and the preface pages of many books (in lowercase: xvii) are numbered this way.
Numbers near 17 in Roman numerals
Frequently asked questions
How do you write 17 in Roman numerals?
17 is written XVII. Break it into X (10), V (5), I (1), I (1) and add the parts: 10 + 5 + 1 + 1 = 17.
What is 17 in Latin?
The Latin cardinal number 17 is “septendecim.” The Romans wrote it as XVII.
What is XVII plus one?
XVII + I = XVIII (18). Adding one can change the whole ending of a numeral, which is why it helps to convert to digits, add, and convert back.