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Factors of 30: 1, 2, 3, 5, 6, 10, 15 and 30.

Factors of 81: 1, 3, 9, 27 and 81.

Common factors are 1 and 3. But 3 is greater than 1 so, GCF(30, 81) = 3.

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11y ago
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8y ago

The GCF is 3.

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Q: What is the greatest common factor of 81 and 30?
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