This site from the Drexel University explains the principles of factoring symbolically using algebra tiles.

Use algebra tiles to explore factoring of polynomials.

A lesson, practice exercise, and teacher resource to help you plan classroom instruction on completing the square. Lesson contains steps to completing the square and two step-by-step examples; practice exercise is a five-question quiz...

From pulling out the common factors of a polynomial to giving hints on how to factor a trinomial that does not have a leading coefficient of 1, a comprehensive tutorial for factoring polynomials is given as well as practice, interactive...

[Free Registration/Login Required] Fun game involving designing a football path around the high school using pentagons and hexagons.