Finding Greatest Common Factor

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Presentation transcript:

Finding Greatest Common Factor

8, 24 2 Use the prime numbers 2,3,5, and 7 Which can divide into 8 and 24 evenly? 8, 24 2

How many times does 2 divide into 8 and 24? 8, 24 2 4, 12

2,3,5,7--Which prime number can divide into 4 and 12 evenly? 8, 24 2 2 4, 12

How many times does 2 divide into 4 and 12? 8, 24 2 2 4, 12 2, 6

2,3,5,7—Which prime number can divide into 2 and 6 evenly? 8, 24 2 2 4, 12 2 2, 6

How many times does 2 divide into 2 and 6? 8, 24 2 2 4, 12 2 2, 6 1, 3

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.

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.