3 little jokes about teaching

TEACHER: Maria, go to the map and find North America .
MARIA: Here it is.
TEACHER: Correct. Now class, who discovered America ?
CLASS: Maria.
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TEACHER: John, why are you doing your math multiplication on the floor?
JOHN: You told me to do it without using tables.
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TEACHER: Glenn, how do you spell 'crocodile?'
GLENN: K-R-O-K-O-D-I-A-L'
TEACHER: No, that's wrong
GLENN: Maybe it is wrong, but you asked me how I spell it.

Enjoy!