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The factors of 45 are:

1, 3, 5, 9, 15, 45

The factors of 156 are:

1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156

The common factors are:

1, 3

The Greatest Common Factor:

GCF = 3

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Q: How do you find the gcf of 45 and 156?
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