Number Patterns
Spot the rule behind each sequence with a free, browser-based logic game. Arithmetic, geometric, square, and Fibonacci patterns included.
Logic & PuzzlesRoman Numerals
Roman numerals use seven letters and one trick: a smaller letter before a larger one subtracts. Below: the seven values, the six subtractive pairs, and how to read left to right.
Choose your difficulty
Pick a level to start playing. You can switch at any time.
How to play
Add the letters, applying the subtraction rule, then tap the value.
Tip: your progress and best score are saved in this browser only.
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Logic & PuzzlesWhat you are actually practicing
Roman numerals use seven letters — I, V, X, L, C, D, M — and one rule beyond addition: a smaller letter placed before a larger one subtracts. So IV is four, not six, and IX is nine.
That single rule is where every mistake happens, because the naive reading (add everything) gives a plausible wrong number.
How the game works
You are shown a Roman numeral and four values. Pick the number it represents. A wrong pick reveals the answer immediately.
Easy stays below forty. Medium goes to ninety-nine. Hard includes hundreds, where C and D appear.
The values worth knowing
Seven letters: I 1, V 5, X 10, L 50, C 100, D 500, M 1000.
Six subtractive pairs: IV 4, IX 9, XL 40, XC 90, CD 400, CM 900.
No letter repeats more than three times. III is fine; IIII is not used.
Strategies that actually raise your score
Read left to right, comparing each letter with the next. If the next one is larger, subtract; otherwise add. One pass, no memorised table needed.
Watch for the subtractive pairs specifically. XL is forty, not sixty; XC is ninety, not one hundred and ten. These two account for most errors above fifty.
Reject the additive answer. The value you get by simply adding every letter is deliberately among the options. If your answer equals that sum, you missed a subtraction.
Use magnitude to orient yourself. A numeral starting with C is in the hundreds; starting with X it is in the tens. That eliminates half the options before any calculation.