Factorial notation strikes again! When the student answers "5!" to "117 + 3," they're technically correct because 5! (5 factorial) equals 120. It's that beautiful mathematical loophole where 5 × 4 × 3 × 2 × 1 = 120. Meanwhile, both student and teacher are congratulating themselves for completely different reasons—one for being accidentally correct through mathematical trickery, the other for thinking they've successfully taught basic addition to someone who clearly needs it. This is why mathematicians shouldn't be allowed to teach elementary school. We make everything unnecessarily complicated and then feel smug about it.
The Big Brain Factorial Play

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