Number
450 in Roman numerals
450 is written CDL
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 CDL 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.
- Ltens · 5L is 50.
400 + 50 = 450
The pair CD 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 LD. It looks like a shortcut, but L is never written before a larger letter to subtract. The correct form is CDL.
- Not CCCCL (5 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today CDL (3 letters) is the standard.
- There's no letter for zero. The zero is simply left out, which is why 450 has 2 parts, not 3.
About the number 450
- 450 is even and can be split into prime factors: 2 × 3 × 3 × 5 × 5, or in Roman numerals II × III × III × V × V.
- CDL has 3 letters. 907 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 |