I would have a more explicit conversation with the teacher. Bring in books that he is reading independently at home. Give her concrete examples of mathematical skills, i.e. Johnny can add up his own Yahtzee score or he can add up the points for Pick up Sticks in his head -- you get the idea. I would not wait for them to "discover " his abilities. If you have a compliant kid, they will only do what the teacher asks and never show true ability. If you have a non-compliant kid, they will start acting out and the school will see them as a behavior problem instead of a smart kid. You may get lucky and find a teacher who will let him keep going at his ability level -- they tend to be the exception, not the rule in my experience. I'd be proactive on this one.
