teachMathematics
Target Audience: Math Teachers of grades 3-12
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"Teach Mathematics is a cool site for math teachers and students with lessons and activities aimed at helping students to improve their math skills. The math levels on this site seem targeted to 3rd grade to high school level learners.Whether you are teaching fractions, algebra, geometry, or statistics, then there are lessons and tools for you. The site has 15 pages of useful tools and materials that both teachers and students will enjoy". (Source)
Link: http://www.teachmathematics.net/