**MathisFun** has great walk-throughs of concepts for Geometry. There are practice problems in the “Your Turn” section at the bottom of each page.

http://www.mathsisfun.com/geometry/index.html

**Wolfram MathWorld** covers topics from Algebra through college-level mathematics. The information is pretty high-level and is probably best for older students.

**SparkNotes Math** has notes about all levels of math, divided up by topic, complete with practice problems and solutions.

http://www.sparknotes.com/math/

**Purple Math** has a goal of explaining math concepts in a user-friendly way that doesn’t sound like a textbook. They cover elementary school topics, Pre-Algebra, Algebra, and Geometry.

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