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The greatest common factor is the highest number that divides exactly into two or more numbers .

9: 1, 3, 9

81: 1, 3, 9, 27, 81

The GCF of 9 and 81 is 9.


The GCF is 9.
The GCF is 9.
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8y ago
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13y ago

Prime factorization of 9 = 3x3

Prime factorization of 81 = 3x3x3x3

It is clear from prime factorizations that 3x3 = 9 is the required answer.

Alternate method:

Factors of 9 are 1, 3 and 9.

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

So, 9 is the gcf of 9 and 81.

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11y ago

9

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Q: What is the greatest common factor of 9 and 81?
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