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"Each animation is embedded in a web page that elaborates on what you will see, but some web-browsers may not like those embeddings; for that reason I've provided direct links to each of those embedded animations on the web page in which it's supposed to appear. If clicking on a link from this page opens a page that fails to display a movie, click on the link to that movie."

On this site you'll find links to more than 350 lesson plans and activities on energy efficiency and renewable energy for grades K-12.

Interactive 2D plotting calculator.  You can even switch to 3D by using the link in the upper right hand corner of the page.

Math Portal, links to resources and descriptions of math functions

A free comprehensive math resource site. Find free worksheets, math ebooks for elementary grades, extensive link list of games, interactive tutorials & quizzes, curriculum guide, and math teaching help articles/lessons. The resources emphasize understanding of concepts instead of mechanical memorization of rules.

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A variety of elementary mathematic interactive websites.

Interactive tools for improving mathematics.

Presentations and resources are available for use in assisting students to understand different aspects of mathematics.