Mental Arithmetic: Our own set of virtual flash cards as a fun way to improve calculation speed and accuracy. Java Kali: Generates personal wallpaper patterns with any of the 17 possible symmetry groups. Leap Fractal: A game based on Sierpinski's Gasket that is fun to play and develops concepts of distance and logical analysis. Torus and Klein bottle games. Totally Tessellated: A site built by 3 high school students (obviously talented students) that provides information on tessellations of the plane. The Gallery of Maths On-Line: A collection of applets illustrating mathematical concepts. Manipula Math: A wonderful collection of interactive java applets from Japan. There is little documentation, but teachers can find useful tools for illustrating many concepts. The Prime Pages: Information on prime numbers. The largest known prime number as of July 12, 2001. This number fills approximately 5000 screens and has 4,053,946 digits, so be prepared to give it time to load - you can always stop the load. Help with hard integrals. Some more of our own interactive tools. Talk on Phyllotaxis Irrationality of the square root of 2

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