Illuminations - From NCTM, a guide to Internet resources.

The Math Forum - Math resources by subject (including lesson plans), articles and links on issues in math education, and key issues in math.

Mathematics Lessons That Are Fun! Fun! Fun! - Online lessons and activities for kindergarten through twelfth grade. Descriptions at the bottom of the page describe the specific mathematics area plus appropriate grade levels.

Mathwire.com - Standards-Based Math Activities is designed to provide activities and appropriate worksheets for teachers to use in their classrooms. All activities and worksheets support the constructivist approach to learning mathematics and the NCTM Standards.

Teacher2Teacher - Part of the Math Forum, discussion of math education with other teachers plus archived discussion and FAQ. 

Organizations 

National Council of Teachers of Mathematics - Principles and Standards for School Mathematics, career opportunities, and activities for students.

Content Sites

A Maths Dictionary for Kids by Jenny Eather - An animated, interactive dictionary of math terms and concepts which includes definitions, examples, activities, practice and calculators.

Ask Dr. Math - A question and answer service for students and teachers. Contains searchable archives. FAQ explains common rules and formulas as well as classic problems.

Math and Science Gateway - Links to math and science resources primarily for students/teachers grades 9-12, but a few links could be used with younger students.

Math League Help Topics - Part of the Math League pages, this is a resources for students in grades four though eight. It serves as an online textbook with explanations of fractions, metric units, and many other topics.

National Library of Virtual Manipulatives - supported by the National Science Foundation, this site contains a library of virtual manipulatives and interactive activites which teach mathematical concepts K-12.

Vi Hart Videos - Vi Hart creates short, engaging fast-paced videos which use everyday objects, food and doodles to demonstrate math concepts such as pi, Fibonacci numbers, mobius strips, binary numbers and patterns,measuring angles, and much more.  She hosts her own Youtube channel and is now also a part of the Khan Academy team

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