Learning Math

Pepito is at home doing his Math homework.

Pepito: "Two plus five the son of a bitch is seven.
Three plus six the son of a bitch is nine".

In that moment, his mother comes in:

Mother: "But Pepito, what are you doing?! Why are you saying that?!"

Pepito: "I'm doing my Math homework, mom".

Mother: "And is that what your teacher taught you?"

Pepito: "Yeees"

Next day, the mother, worried about the education his son is receiving,
goes to Pepito's school to talk to the teacher.

Mother: "I would like to know what you are teaching my son in Math?

Teacher: "Oh, sure. We are learning addition problems."

Mother: "And... are you teaching them to say two plus two the son
of a bitch is four?"

Teacher: "No way! What I taught them was two plus two THE SUM OF
WHICH IS four."