Silly Math Jokes!

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Across
  1. 2. What's a swimmer's favourite kind of math?
  2. 4. What's a math teachers favourite tree?
  3. 6. What do you call two friends who love math?
  4. 7. Who is the king of the pencil case?
Down
  1. 1. Who invented algebra?
  2. 3. What's a math teacher's favourite season?
  3. 5. Have you heard the joke about the statistician?