A little boy was doing maths homework...

A little boy was doing maths homework...

...saying to himself, 2+5 the son of bitch is 7,
3+6 the son of bitch is 9
His mother heard this and asked "What are you doing?"
Boy, "Doing my maths homework".
Mom: And this is how your teacher taught you?

Boy: "Yes"

Infuriated mother called the teacher: Are you teaching maths to children by saying 2+2, the son of bitch is 4?

Teacher started laughing and answered: "what I taught them was, 2+2 THE SUM OF WHICH IS 4...