Valid or Not? Roman Numerals
- Question
- –/12
- Score
- 0
- Streak
- 0
A Roman numeral appears. Is it written correctly? You have 15 seconds for each.
How to play
Twelve numerals, half of them written correctly. Answer Valid or Not valid within 15 seconds. After each answer you see why: the rule that was broken and the correct form.
The three mistakes in this game
- Too many repeats: IIII, XXXX, VV. No symbol appears more than three times in a row, and V, L and D never repeat.
- Subtraction that is not allowed: IL, IC, VX, XM. Only I, X and C subtract, and only from the next two symbols.
- Wrong order: VIX, IIX. Values go from largest to smallest, with at most one smaller symbol in front.
More Roman numeral games
- XRoman Numerals Quiz10 questions by level, from 1–20 to 1–3999 and years
- IDaily ChallengeFive mixed questions, the same for everyone each day
- LXRoman Numerals Speed TestAs many conversions as you can type in 60 seconds
- MMBuild the NumberPut the symbols in order to write the number
- VIMatchstick PuzzlesMove one stick to make the equation true
- XIIRoman Numeral ClockRead the time on a Roman numeral clock face
Common questions
Why is 99 not IC?
I can only come before V or X. 99 is XCIX: XC (90) + IX (9).
Is IIII ever correct?
Not in standard notation, where 4 is IV. Many clock faces still show IIII; the clock game lets you practice both.