GCF

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Greatest Common Factor... defined, and worked out USING PRIME FACTORIZATION method.
I teach GCF and LCM using a table to stay organized.
It is a big help in staying on track and NOT making a mistake.
2 examples: GCF of 36 and 44, and GCF of 10 and 21.
What to do when you have no matching prime factors... find out here.