More Matchstick Mathematics

The Puzzler

RAY: Anyway, the question was move and reuse one matchstick to make this sum equal not to 10, but to four. And what you do is you take the plus sign between the one and the two, take the vertical matchstick, and put it horizontally in front of the one, so now the thing reads minus one, minus two, plus three plus four equals what?

TOM: Oh, four.

RAY: And a lot of people have trouble with this because the idea of putting a negative sign in front.

TOM: Yeah, I had trouble with that. Sixth grade, seventh grade, eighth grade, ninth grade.

RAY: That encompassed 12 years. Anyway, do we have a winner?

TOM: You bet we have a winner. The winner is Sue Goodney from Bloomington, Indiana.

[ Car Talk Puzzler ]

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