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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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.
Since 18 is a factor of 90 and it is the largest factor of itself, the greatest common factor of 18 and 90 is 18.Since 18 is a factor of 90, it is automatically the GCF.
9 is the greatest common factor of 18, 45 and 54.
The greatest common factor of 18 and 45 is 9.
The GCF is 9.
Since 9 is a factor of 18, it is automatically the GCF of this problem.