9 in Roman Numerals
9 is written as IX in Roman numerals.
How IX is built
Roman numerals are written one place value at a time, largest first. 9 splits into 9 (ones), and each piece becomes its own group of symbols:
| Symbol | Value | Running total | Note |
|---|---|---|---|
| IX | 9 | 9 | subtractive pair: 10 − 1 |
Read left to right, the symbols add up: 9 = 9. IX uses one subtractive pair (IX) -- a smaller symbol placed before a larger one is subtracted, which is how Roman numerals avoid writing four of the same symbol in a row.
The symbol IX (9) is the largest one used to build IX -- it also shows up in 9 other numbers between 1 and 100.
Frequently Asked Questions
What is 9 in Roman numerals?
9 in Roman numerals is IX. It is built from 1 symbol group: IX (9).
How do you write IX as a number?
Add the symbol values left to right, subtracting whenever a smaller symbol sits before a larger one: 9 = 9.
Does IX use subtractive notation?
Yes -- IX. Roman numerals never repeat a symbol four times, so 4 and 9 in any place are written as a smaller symbol before a larger one (IV for 4, IX for 9, XL for 40, XC for 90, CD for 400, CM for 900).
What comes before and after 9 in Roman numerals?
8 is VIII and 10 is X. Counting up in Roman numerals changes only the lowest place until it rolls over, the same way decimal digits do.
How long is IX compared to other numbers near 9?
IX is 2 characters long. Roman numerals don't get longer in a straight line with the number they represent -- VIII (8) is 4 characters and X (10) is 1 character, because each number is rebuilt from scratch out of the largest symbols that fit, not incremented digit by digit.
More Number Conversions
- Roman Numeral Converter (convert any number)
- Factors of 9
Nearby numbers
7 is VII, 8 is VIII, 10 is X, 11 is XI.
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