Greatest Common Factor

Students learn that the Greatest Common Factor of two numbers is the largest factor shared by both numbers. For example, to find the Greatest Common Factor of 8 and 12, since factors of 8 are 1, 2, 4, and 8, and factors of 12 are 1, 2, 3, 4, 6, and 12, the Greatest Common Factor of 8 and 12 is 4.

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