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Khan Academy
Khan Academy: Factors and Multiples Review
Reviews what factors and multiples are and provides some problems for practice. Solutions are accompanied by explanations.
Cool Math
Coolmath: Pre Calculus Horizontal and Vertical Lines Review
This CoolMath resource provides a review of horizontal and vertical lines.
Cool Math
Coolmath: Pre Calculus Freaky Factoring
This CoolMath resource provides a review of factoring polynomials and an introduction to factoring exponents that are fractions.