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Goal is "to develop middle-grade mathematics materials that teach cryptography, the science of sending secret messages. Since kids enjoy sending and breaking secret messages, cryptography provides a very motivating setting for applying mathematics."

"Yenka Mathematics is an easy-to-use tool for experimenting with mathematical models."

"This Resource Center supports users of the award-winning Dynamic Geometry® mathematics visualization software, The Geometer's Sketchpad."

Math worksheets to visualize, interact with and explore math

Amazing collection of math resources and interactive activities