Factoring by GCF
What is GCF? http://www.virtualnerd.com/algebra-1/polynomials-and-factoring/factors-and-greatest-common-factors/greatest-common-factors/greatest-common-factor-monomials
Video: https://www.youtube.com/watch?v=3RJlPvX-3vg
Simple Quiz for Identifying GCFs: https://www.thatquiz.org/tq/practicetest?4y8vdaybdoj
Quiz: http://www.regentsprep.org/regents/math/algebra/av6/PracFact4.htm
Quia Game Factoring: https://www.quia.com/cz/43439.html?AP_rand=553048134