The following resources may be useful for teachers and other educators:
Come participate in the Canadian Open Mathematics Challenge (COMC), held each November. Students from across Canada and around the world are invited to compete in this written competition held at their own schools. Besides prizes and awards, the top students are get invitations to the elite national math competitions such as the Canadian Math Olympiad and from there, they could be invited to train and represent Canada at international events such as the APMO, EGMO and even the International Mathematical Olympiad!
Features lessons, interactive activities, enrichment challenges, and practice with feedback, provided by the Centre for Education in Mathematics and Computing (CEMC) at the University of Waterloo.
The online encyclopedia of integer sequences is a good way to explore the wealth of patterns that were studied throughout history. If you have a pattern that you are trying to understand, the encyclopedia can give you suggestions of how your pattern is formed.
A collection of small computer programs which implement one-player puzzle games.
Journal of the National Council of Teachers of Mathematics (NCTM), addressing all levels of math education.
High quality math games including Intermediate, Middle and High School math games. Teachers can invite and guide students through math curriculum.
This site contains information for teachers and students from K-12. It offers online multimedia investigations, classroom video vignettes, standard-based lesson plans, links to reviewed websites and more.
The Math Forum has a rich history as an online hub for the mathematics education community.