30 in Roman numerals
XXX
The number 30 is written XXX in Roman numerals.
How XXX breaks down
| Symbols | Value |
|---|---|
XXX | 3 × 10 = 30 |
XXX | 30 |
Every symbol here is written in descending order and simply added together — no subtractive pairs are involved.
Nearby numbers
| Number | Roman numeral |
|---|---|
| 25 | XXV |
| 26 | XXVI |
| 27 | XXVII |
| 28 | XXVIII |
| 29 | XXIX |
| 30 | XXX |
| 31 | XXXI |
| 32 | XXXII |
| 33 | XXXIII |
| 34 | XXXIV |
| 35 | XXXV |
The seven symbols
I | 1 | C | 100 |
V | 5 | D | 500 |
X | 10 | M | 1,000 |
L | 50 |
30 in other notations
| Roman | XXX |
| Binary | 11110 |
| Hexadecimal | 1E |
| Octal | 36 |
| Written out | thirty |
Writing it by hand
Work down through the symbol values, taking as many of each as will fit before moving to the next. For 30:
3 × X = 30 remaining: 0The result reads XXX — 3 characters, against 2 digits in Arabic numerals.
Frequently asked questions
What is 30 in Roman numerals?
XXX
How do you read XXX?
Work left to right, adding each symbol — except where a smaller symbol precedes a larger one, in which case it is subtracted. XXX is 30.
How do you write 30 in words?
thirty.
Why is there no zero?
Roman numerals have no symbol for zero. The concept reached Europe only with Hindu-Arabic numerals, centuries after the system was in use — which is a large part of why it was eventually replaced for arithmetic.