The basics of the concept of the greatest common factor (GCF) of two numbers. The name itself explains what to do: find the factors of the two numbers, find the COMMON ones among them, and choose the greatest.
I go through several examples using this definition.
In the 2nd part of the lesson (at https://www.youtube.com/watch?v=DIKRJysC9HU) I show a another method for finding the GCF, which is based on the prime factorization of the numbers.
This lesson is meant for 6th grade math and onward.
Tagged under: greatest common factor,gcf,6th grade,math
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