The mathematics is sound, well-developed visually and conceptually, sequenced well, and continually spirals to bring prior concepts to higher levels. Again, there is abundant interaction, including calls for responses whether it be pushing a button to see a next step, trying an experiment, manipulating a curve, doing practice exercises, or taking a separate test. All lessons typically wrap around a central application problem that is based on real life and not artificially contrived. Typically, the application is introduced, then the user learns the mathematical tools that lead to its solution. The Pythagorean Theorem, the Golden Rectangle in art and spirals in nature, relative density, maximizing profit in a motorcycle helmet factory, growth and decay, compound interest, carbon dating, recycling, pollution, the Richter Scale, and more, all of importance and interest to adults.
Geometry is mixed throughout as connections are made.
With a few minor modifications, each is capable of a 10. See what you think. The program is also available on CD for Windows.