I would personally have my students use http://www.coolmath.com/home.htm , because it is a fun free website. Students can access it and play fun games that will help them progress in learning the tools and different areas for their lesson.
Also, i would recommend that my students use http://www.funbrain.com/. It is a good website for kids of all ages, but to me goes more to the younger age groups, but its fun and productive.
