Number
29 in Roman numerals
29 is written XXIX
Type any other number or numeral below to convert it.
Above 3,999? Type the barred part in brackets, e.g. (IV)CC = 4,200.
How XXIX is built
Roman numerals are written one decimal place at a time, largest first.
- XXtens · 2X written 2 times: 2 × 10 = 20.
- IXones · 9I before X means 10 − 1 = 9. This saves writing VIIII.
20 + 9 = 29
The pair IX uses subtraction: a smaller letter before a larger one is taken away from it. Only six pairs work this way: IV, IX, XL, XC, CD and CM. More on subtraction
Mistakes to avoid
- Not XXVIIII (7 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today XXIX (4 letters) is the standard.
About the number 29
- 29 is a prime number: only 1 and 29 divide it exactly.
- XXIX has 4 letters. 784 of the numbers up to 1,000 have longer numerals.
- As a day of the month, XXIX is the 29th. Write a date
Counting from 21 to 30
Every number from 21 to 30 starts XX (20); only the ending changes.
| Number | Roman numeral |
|---|---|
| 21 | XXI |
| 22 | XXII |
| 23 | XXIII |
| 24 | XXIV |
| 25 | XXV |
| 26 | XXVI |
| 27 | XXVII |
| 28 | XXVIII |
| 29 | XXIX |
| 30 | XXX |