The calculations are challenging, but actually teach shortcuts for squaring, multiplying, dividing, etc. Learn about gods and heroes of ancient civilizations at this site. At this site, students can find out about the latest research on the brain. This information is presented for children. There are many links to information, experiments and activities that would provide a great extention for students.
Students can learn how math is used in science, music, investing, at home, and on trips.
Most pages include a quiz. Lots of information here. The site is not interactive, but has some interesting and thought provoking problems for younger students. Each unit takes up to 6 weeks. Learn how the Chicago Field Museum is constructing the largest T-Rex dinosaur ever, found in South Dakota in 1990.