Originally Posted by LNEsMom
I think I have been avoiding undermining the teacher's authority by telling him that the questions are poorly written and that he is in fact correct. But I guess I am going to have to do that, though, in order for him to feel secure in his own abilities, which is ultimately more important.

I see this point; it's important, because you (well, me too) don't want to give the child the impression that it's okay to be disrespectful of the teacher. I let my daughter write corrects answers (e.g. as in the probability problem), but I also tell her that it's only a few problems out of dozens and that not every teacher can catch every mistake. Maybe we even missed one and just barreled through it! I think there are ways to address it carefully. I had this same conversation with my older son last year. He's much more likely to be brusque, but he got the idea, too.