900 in Roman numerals
900 in Roman numerals
CM
900 is written CM in Roman numerals. That is 1 symbol group added together, reading left to right from the largest value down.
How it breaks down
| Group | Value | Subtraction | Running total |
|---|---|---|---|
| CM | 900 | M − C | 900 |
Why the smaller symbol comes first
CM uses subtractive notation in one place: CM means M minus C, or 900. 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 | no |
| V | 5 | no |
| X | 10 | no |
| L | 50 | no |
| C | 100 | yes — 1× |
| D | 500 | no |
| M | 1,000 | yes — 1× |
The same number, other ways
- In words
- Nine hundred
- Roman numeral
- CM
- Symbol count
- 2 characters
- Binary
- 1110000100
- Hexadecimal
- 384
The numbers either side
| Number | Roman numeral |
|---|---|
| 898 | DCCCXCVIII |
| 899 | DCCCXCIX |
| 900 | CM ← |
| 901 | CMI |
| 902 | CMII |
Common questions
- What is 900 in Roman numerals?
- 900 is CM.
- What does CM mean?
- CM is the Roman numeral for 900 — 900.
- How do you write 900 in Roman numerals?
- Take the largest value that fits and repeat until nothing is left: CM (900). That gives CM.
Related pages
- 898 in Roman numerals DCCCXCVIII
- 899 in Roman numerals DCCCXCIX
- 901 in Roman numerals CMI
- 902 in Roman numerals CMII
- 4 in Roman numerals IV
- 9 in Roman numerals IX
- 14 in Roman numerals XIV
- 19 in Roman numerals XIX
- 40 in Roman numerals XL
- 42 in Roman numerals XLII
- 49 in Roman numerals XLIX
- 50 in Roman numerals L
Sources
- Calculated on this page — At One Place