Mathematic software designed for calculating, graphing, documenting and collaborating on a wide range of technical solutions. Must sign-in to get pricing information. Other Mathsoft products available. A mixed bag of interactive math puzzles and philosophy. You can end up spending a lot of time at this site.
Site covers a large number of terms, but it is still in development.
Pass along any words not found to the Webmaster. Also includes divisibility rules and multiplication rules. Learn tricks to hook your students. Sends you a Monday morning math wake-up problem to stimulate your mind. Designed to teach you to calculate in your mind at a speed to beat the calculator.