Minus and Minus is Equal to Plus – Very Funny Math Jokes

Teacher and Student Math Jokes

David came to class on late.
Teacher of mathematics was taking the class.

David ( standing in front of door) : May I come in sir?
Teacher (with annoying) :  No.
Looking at the students, now teacher is teaching “Always minus and minus is plus”.

David (again) : May I come in sir?
Teacher (loudly) : No.

David entered into the class easily.
Teacher :  Stop ! Haven’t I forbidden you to enter into the class ?

David : Yes sir.
Teacher : Why do you enter into the class?

David : “If Always minus and minus is plus, then no and no must be yes?
Teacher (with astonish) : Ok, enough.  Take your sit.