440 in Roman numerals
CDXL
The number 440 is written CDXL in Roman numerals.
How CDXL breaks down
| Symbols | Value |
|---|---|
CD | 400 |
XL | 40 |
CDXL | 440 |
This numeral uses the subtractive rule: a smaller symbol placed before a larger one is subtracted from it. Only six such pairs are legal — IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900).
Nearby numbers
| Number | Roman numeral |
|---|---|
| 435 | CDXXXV |
| 436 | CDXXXVI |
| 437 | CDXXXVII |
| 438 | CDXXXVIII |
| 439 | CDXXXIX |
| 440 | CDXL |
| 441 | CDXLI |
| 442 | CDXLII |
| 443 | CDXLIII |
| 444 | CDXLIV |
| 445 | CDXLV |
The seven symbols
I | 1 | C | 100 |
V | 5 | D | 500 |
X | 10 | M | 1,000 |
L | 50 |
440 in other notations
| Roman | CDXL |
| Binary | 110111000 |
| Hexadecimal | 1B8 |
| Octal | 670 |
| Written out | four hundred and forty |
Writing it by hand
Work down through the symbol values, taking as many of each as will fit before moving to the next. For 440:
CD = 400 remaining: 40
XL = 40 remaining: 0The result reads CDXL — 4 characters, against 3 digits in Arabic numerals.
Frequently asked questions
What is 440 in Roman numerals?
CDXL
How do you read CDXL?
Work left to right, adding each symbol — except where a smaller symbol precedes a larger one, in which case it is subtracted. CD is 400, XL is 40, giving 440 in total.
How do you write 440 in words?
four hundred and forty.
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.