99 in Roman numerals
99 is written XCIX. In chunks: XC (90) + IX (9) = 99.
The answer
XCIX
99 in Roman numerals is XCIX.
How XCIX is built
To write it, split 99 into 90 + 9. 90 is XC, 9 is IX, so 99 is XC then IX: XCIX.
To read it, XCIX has 2 chunks, and XC and IX are take-away pairs, worked out first and then added.
| Chunk | Worth | Why |
|---|---|---|
| XC | 90 | X before C: take away |
| IX | 9 | I before X: take away |
The mistake to watch for
Writing 99 as IC
Wrong: IC
IC looks like "100 take away 1", but only four pairs ever subtract up to 100: IV, IX, XL and XC. Split 99 into 90 and 9 instead: XC and IX make XCIX.
Check it with the converter
Type IC to see why IC is not 99. The rule numbers it gives are the three rules on the Roman numerals page.
Converter set to XCIX (99).
Keep going
Questions parents ask
What is 99 in Roman numerals?
99 is XCIX.
What comes before and after XCIX?
98 is XCVIII and 100 is C.
Does XCIX use subtraction?
Yes, twice: XC (90) and IX (9). In each pair the smaller letter comes first, so it is taken away from the bigger one.
What is the biggest letter in XCIX?
C, which is 100. XCIX has 4 letters.
Careful reading is an 11+ skill
Reading all 4 letters of XCIX in order is the careful checking 11+ papers reward. The free diagnostic covers all four subjects, with no card needed.