IX Roman Numeral: What Number Is IX?
Numbers and numerals are detected as you type. Enter copies, Alt+S swaps.
IX is 9 (nine). I stands before a larger symbol and is subtracted; everything else is added: −1 + 10 = 9.
Reading IX letter by letter
| Letter | Value | Step | Total |
|---|---|---|---|
| I | 1 | subtract (X is larger) | −1 |
| X | 10 | add, closing IX | 9 |
Why IX is valid
- The pair IX
- An allowed pair, and the only place where the values rise.
Easy to confuse with IX
XI, the same letters swapped, is 11 (XI roman numeral).
VIIII is an old additive form; the standard form of 9 is IX. Wikipedia
| Typed | Problem | Reads as |
|---|---|---|
| IIX | Only one I can be subtracted from a larger letter. | VIII (8) |
| IXX | Letters are out of order: values must go from largest to smallest. | XIX (19) |
IX in names, titles and systems
- ReignLouis IX1226–1270Wikipedia
- Super BowlSuper Bowl IXJanuary 12, 1975New OrleansPittsburgh Steelers beat Minnesota Vikings 16–6Wikipedia
- TitleStar Wars: The Rise of SkywalkerEpisode IX2019Wikipedia
- OlympicsGames of the IX Olympiad1928AmsterdamWikipedia
- EventWrestleMania IX1993Wikipedia
- Clock facedial shows IXClock faces that use IIII for four still write nine as IX, not VIIIIWikipedia
9 in Roman numerals · Roman numeral rules
