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Internet Detective provides the opportunity for a student to improve their searching skills. The site is broken into information pieces, review sections to apply the information and practice sections where you are the detective.

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.