I teach 5th grade math in Texas (TAKS) and have started laminating activities that review basic comp skills (rounding, mult., divis., etc.) for students to write on with vis-a-vis markers. Since the "task cards" are self checking, the students work on them very independently. The fun for them is trying to solve the riddle at the top of the page. I get these pages from books like pizzazz! It also makes it fun for them since they get to use a marker. They are also really good at cleaning them up and putting away since they might loose their privilage if they don't. Hope this idea helps
Oh, I forgot. I copy them on tagboard and color code. Ex: Division in green, Rounding in yellow, etc.