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To find the greatest common factor for any group of numbers you must make a list of all the factors for each number.

The factors of 18 are: 1, 2, 3, 6, 9, 18

The factors of 9 are: 1, 3, 9

Therefore, the greatest common factor of 18 and 9 is 9.

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12y ago
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7y ago

9 is a factor of 18. 9 is the largest factor of 9 and thus the largest possible common factor of 9 and 18. So, the greatest common factor of 9 and 18 is 9.
The GCF is 9.

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Wiki User

11y ago

Since 9 is a factor of 18, it is automatically the GCF of this problem.

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Q: What is the greatest common factor of 9 and 18?
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