42 in Roman numerals
42 in Roman numerals
XLII
42 is written XLII in Roman numerals. That is 3 symbol groups added together, reading left to right from the largest value down.
How it breaks down
| Group | Value | Subtraction | Running total |
|---|---|---|---|
| XL | 40 | L − X | 40 |
| I | 1 | — | 41 |
| I | 1 | — | 42 |
Why the smaller symbol comes first
XLII uses subtractive notation in one place: XL means L minus X, or 40. A smaller symbol placed before a larger one is subtracted from it rather than added, which is why IX is nine and not eleven.
Only six such pairs are valid — IV, IX, XL, XC, CD and CM. That restriction is what makes the notation unambiguous: IIII and IC both look like they should work, but neither is standard, and only one spelling of any number is correct.
The symbols
| Symbol | Value | Used here |
|---|---|---|
| I | 1 | yes — 2× |
| V | 5 | no |
| X | 10 | yes — 1× |
| L | 50 | yes — 1× |
| C | 100 | no |
| D | 500 | no |
| M | 1,000 | no |
The same number, other ways
- In words
- Forty-two
- Roman numeral
- XLII
- Symbol count
- 4 characters
- Binary
- 101010
- Hexadecimal
- 2A
The numbers either side
| Number | Roman numeral |
|---|---|
| 40 | XL |
| 41 | XLI |
| 42 | XLII ← |
| 43 | XLIII |
| 44 | XLIV |
Common questions
- What is 42 in Roman numerals?
- 42 is XLII.
- What does XLII mean?
- XLII is the Roman numeral for 42 — 40 + 1 + 1.
- How do you write 42 in Roman numerals?
- Take the largest value that fits and repeat until nothing is left: XL (40), then I (1), then I (1). That gives XLII.
Related pages
Sources
- Calculated on this page — At One Place