990 in Roman numerals
990 in Roman numerals
CMXC
990 is written CMXC in Roman numerals. That is 2 symbol groups 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 |
| XC | 90 | C − X | 990 |
Why the smaller symbol comes first
CMXC uses subtractive notation in 2 places: CM means M minus C, or 900; XC means C minus X, or 90. 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 | yes — 1× |
| L | 50 | no |
| C | 100 | yes — 2× |
| D | 500 | no |
| M | 1,000 | yes — 1× |
The same number, other ways
- In words
- Nine hundred ninety
- Roman numeral
- CMXC
- Symbol count
- 4 characters
- Binary
- 1111011110
- Hexadecimal
- 3DE
The numbers either side
| Number | Roman numeral |
|---|---|
| 988 | CMLXXXVIII |
| 989 | CMLXXXIX |
| 990 | CMXC ← |
| 991 | CMXCI |
| 992 | CMXCII |
Common questions
- What is 990 in Roman numerals?
- 990 is CMXC.
- What does CMXC mean?
- CMXC is the Roman numeral for 990 — 900 + 90.
- How do you write 990 in Roman numerals?
- Take the largest value that fits and repeat until nothing is left: CM (900), then XC (90). That gives CMXC.
Related pages
- 988 in Roman numerals CMLXXXVIII
- 989 in Roman numerals CMLXXXIX
- 991 in Roman numerals CMXCI
- 992 in Roman numerals CMXCII
- 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