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Conceptua Math has some free tools available for users. While there is a subscription with conceptua math, the free things look interesting and worth checking out.

Free

Grade 8 the Learning Equation Math these interactives cover area and perimeter: Quadrilaterals and Circles

Great video Donald Duck in Mathmagic Land. Shows the connection between music and math. About Pythagorean Theorm.

Edhelper.com is a great collection of educational resources in all subjects. This is a paid service for a low cost that can be purchased in teacher packs of five as well.

Shmoop, a publisher of digital educational resources, has added pre-algebra to its list of free learning guides. The online Pre-Algebra Learning guides contain hundreds of topics with succinct explanations, diagrams, interactive examples, practice problems, and real-world applications. Pre algebra is Shmoop's first foray beyond its core humanities offerings. At the home page click on the pre algebra tab

Some free materials.

Wolfram/Alpha is to be the first web-based tool that can find answers to all systematic knowledge in the world. For educators, this "computational iknowledge engine" can find objective and fact-based answers for a variety of subject areas. Type in "Newton's Law," for example, and the formula for force is explained. Enter in an equation for a line, and the site plots the line on a graph. Ask "What is the GDP of the United States and Canada?" and a chart depicts a side-byside comparison of the nations' economic data.

Good resource for those building online courses.