**CoolMath** has a lot of example problems with explanations and a couple of practice problems for each topic.

http://www.coolmath.com/precalculus-review-calculus-intro

**SOS Math** has a couple of examples for each of their topics as well as a few practice problems with answers. Their only Pre-Calculus topics relate to matrices, but who doesn’t need to review those?

http://www.sosmath.com/matrix/matrix.html

**Wolfram MathWorld** covers topics from Algebra through college-level mathematics.

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

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

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