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Matchstick Math (Mathematchsticks in the UK version) is a puzzle in Professor Layton and the Unwound Future.
Puzzle
- US Version
The math equation below is written in matchsticks! Read as Roman numerals, it means 1 + 11 = 10.
To make this a valid equation, what's the fewest number matches that you need to move?
- UK Version
Here's an equation that's been written using matches. Read as Roman numerals, it means: 1 + 11 = 10.
What's the minimum number of matches you need to move to make this equation valid?
Hints
Solution
Incorrect
Too bad!
There's a twist here somewhere...
Correct
You're on fire!
Zero matches is correct.
If you look at the equation upside down, it becomes 10 = 9 + 1 in Roman numerals.
- US Version
The phrase "fewest number of matches" might have tricked you into thinking "at least one match," but "fewest" can mean no matches at all!
- UK Version
The phrase "minimum number" might have tricked you into thinking "at least one match", but "minimum number" can mean moving no matches at all!
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