Supported by Leap of Faith Financial Services in Canada (and a ton of banner advertisements), Math.com tries to provide new ways for anyone--students, parents, teachers--to learn quality mathematics. Their claim includes the use of sound educational principles, proprietary technology, and unique learning experiences such as assessment, on-demand courses, 24/7-live online tutoring, and expert answers to math questions.
Admittedly, the web site does do all of this in some fashion. It claims to specialize in both homework help and review in the areas of basic math, pre-algebra, algebra, geometry, trig, statistics, and calculus...but often the help seems little more than that found in a text...and the review focuses on practicing computational skills.
The site does include multiple "cool tools" such as graphers (sub-par TI's) and some useful tables that cover secondary math topics. One "bad" part provides a list of "Unproved Theorems," a list that includes Euclid's Parallel Postulate. Now, it is wrong to call this an unproved theorem...especially if some gallant young mathematician (not named Saccheri or Wiles) should take on the challenge of trying to prove it.
But, the main reason this site is recommended is its "exploratory and recreational introductions to the world of math":
The site is worth a look....but focus on finding the good parts that meet your needs and interests....and ignore the rest.
- Math-based games include interactive versions of Peg Solitaire, Fiver, Hare & Hounds, Tower of Hanoi, TacTix, and Hex-7.
- Wonders of Math is the best part....including dynamic explorations of interesting things such as Spirographs, the Game of Life, a Roman Numeral Calculator (something everyone needs), a Maze generator, and links to other sites that provide rich experiences with chaos, knots, tesselations, and orgami.