99 in Roman numerals
XCIX
The number 99 is written XCIX in Roman numerals.
How XCIX breaks down
| Symbols | Value |
|---|---|
XC | 90 |
IX | 9 |
XCIX | 99 |
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 |
|---|---|
| 94 | XCIV |
| 95 | XCV |
| 96 | XCVI |
| 97 | XCVII |
| 98 | XCVIII |
| 99 | XCIX |
| 100 | C |
| 101 | CI |
| 102 | CII |
| 103 | CIII |
| 104 | CIV |
The seven symbols
I | 1 | C | 100 |
V | 5 | D | 500 |
X | 10 | M | 1,000 |
L | 50 |
99 in other notations
| Roman | XCIX |
| Binary | 1100011 |
| Hexadecimal | 63 |
| Octal | 143 |
| Written out | ninety-nine |
Writing it by hand
Work down through the symbol values, taking as many of each as will fit before moving to the next. For 99:
XC = 90 remaining: 9
IX = 9 remaining: 0The result reads XCIX — 4 characters, against 2 digits in Arabic numerals.
Frequently asked questions
What is 99 in Roman numerals?
XCIX
How do you read XCIX?
Work left to right, adding each symbol — except where a smaller symbol precedes a larger one, in which case it is subtracted. XC is 90, IX is 9, giving 99 in total.
How do you write 99 in words?
ninety-nine.
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.