Maths ~ Very funny

A little boy was doing his math homework & saying:

2+5, the son of a bitch is 7

3+6, the son of a bitch is 9. . .

His Mom: What are you doing?

Boy: I'm doing maths homework

Mom: this is how your teacher taught you?

Boy: Yes

Infuriated, Mom asked the teacher the next day-

'What are you teaching my son in maths?'

Teacher: Right now, we are learning addition.

Mom: you teaching them to say 2+ 2, the Son of a bitch is 4?

Teacher after laughing: What I taught them was, 2+2, The Sum of Which is 4 !