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1. Write out their prime factorizations. 2. Determine which prime factors are shared by all 3 numbers. 3. Multiply them together. 4. That product is the gcf.

For example, the gcf of 84, 126, and 686 is 14 because

1. 84=2x2x3x7

126=2x3x3x7

686=2x7x7x7

2. All three numbers share 2 and 7 as common prime factors.

3. 2x7=14

4. 14 is the gcf

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11y ago

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