Joke: Math teacher: You can't use y to represent a single point!
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Joke: What is one math problem that no German person can get wrong?
Punch line: Do you know the square root of 81?
Joke: Why did the mathematician name his dog "Cauchy?"
Punch line: He left a residue at every pole.
Joke: Why is the tan function so quick to differentiate?
Punch line: It ends in secs.
Joke: What do you get if you divide the circumference of a jack-o-lantern by its diameter?
Punch line: Pumpkin pi!