Number
442 in Roman numerals
442 is written CDXLII
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 CDXLII is built
Roman numerals are written one decimal place at a time, largest first.
- CDhundreds · 4C before D means 500 − 100 = 400. This saves writing CCCC.
- XLtens · 4X before L means 50 − 10 = 40. This saves writing XXXX.
- IIones · 2I written 2 times: 2 × 1 = 2.
400 + 40 + 2 = 442
The pairs CD and XL use 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 CCCCXXXXII (10 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today CDXLII (6 letters) is the standard.
About the number 442
- 442 is even and can be split into prime factors: 2 × 13 × 17, or in Roman numerals II × XIII × XVII.
- CDXLII has 6 letters. 396 of the numbers up to 1,000 have longer numerals.
Counting from 441 to 450
Every number from 441 to 450 starts CD (400); only the ending changes.
| Number | Roman numeral |
|---|---|
| 441 | CDXLI |
| 442 | CDXLII |
| 443 | CDXLIII |
| 444 | CDXLIV |
| 445 | CDXLV |
| 446 | CDXLVI |
| 447 | CDXLVII |
| 448 | CDXLVIII |
| 449 | CDXLIX |
| 450 | CDL |