Minimal. The school gives them a math packet to complete, essentially one worksheet per week. Other than that, I expect them to read, which they usually do in the a.m. before camp (they are very early risers and we don't allow any electronics in the a.m.) and I also still read to them at bedtime. For my 4th grader that reading is still typically fiction but for my 6th grader, we often read non-fiction books or articles from newspapers or NPR.org about science, entertainment, or other topics that interest him.