There's plenty of those do-at-home workbooks everywhere. They're presented in a colorful/fun manner for kids, with lots of puzzles/games/problem solving. Get your child a book that is for the next grade that they just graduated from. It will give allow them to try and use what they learned in solving new things, without boring them to tears, and will allow them to ask you for help with things they don't understand. Making you look like a genius in the process. All around win-win :)