I'm sorry, but I would just call this a typical public school. Depending on your state, they have no legal responsibility to accommodate the gifted, no resources to do so, and no incentive to do so (I would imagine your dc raises the school's mean math scores). On top of that, there are likely nontrivial administrative problems in getting a 4th grader into a middle- or high-school algebra class daily.
I'm not excusing their decision. Ideally, your dc would receive an appropriate education. We gave up trying to get one from the public schools. We afterschooled intensively, and now we homeschool.
