Tricki is a new wiki for mathematics students. Tricki is a compilation of articles explaining how to solve difficult math problems. Tricki is a relatively new project and anyone is welcome to contribute to it. Most of the articles currently on Tricki deal with the more difficult problems that students are likely to encounter in their junior or senior years of high school or in a college mathematics class.
Here are some related resources that may be of interest to you:
Free Math Worksheets
Ten Problem Solving Games for K-8
Math Links You Might Have Missed
