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Finding Greatest Common Factor
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8, 24 2 Use the prime numbers 2,3,5, and 7
Which can divide into 8 and 24 evenly? 8, 24 2
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How many times does 2 divide into 8 and 24?
8, 24 2 4, 12
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2,3,5,7--Which prime number can divide into 4 and 12 evenly?
8, 24 2 2 4, 12
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How many times does 2 divide into 4 and 12?
8, 24 2 2 4, 12 2, 6
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2,3,5,7—Which prime number can divide into 2 and 6 evenly?
8, 24 2 2 4, 12 2 2, 6
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How many times does 2 divide into 2 and 6?
8, 24 2 2 4, 12 2 2, 6 1, 3
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2,3,5,7—Which prime number can divide into 1 and 3 evenly?
8, 24 2 4, 12 2 2, 6 2 1, 3 None of them can.
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Last step- multiply all of the numbers going vertically on the left side of the problem.
8, 24 2 X X 4, 12 2 X 2, 6 2 1, 3 = 8 The GCF of 8 and 24 is 8.
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