Do you point out your teacher's mistakes?

[Water]

We have our general maths teacher, whos a nice bloke, very slangy and isn't strict in our class. He's also our maths teacher, and when he does something minor spellig mistake or small mathematics problem. I never tell him bout the mistake! The other students do, but they do it in a condescending way, feel sorry for him ):. Such a cool bloke

[ryley]

I did point out mistakes sometimes, and not to sound arrogant but it was usually only mistakes which I though would both give a really wrong answer or an incorrect method was used, and no one else was gonna pick up on it. All of my teachers were fine with this, because it saved them wasting time and I wasn't rude about it. As long as your not the dickhead who screams out how the teacher fucked up massively by forgetting a ".dx" in a working line of a massive question, I think it's usually alright.