The GCF is 3.
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The GCF of 3, 15, and 18 is: 3
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.
The GCF of 12, 15, 18, and 30 is 3.
2 is the greatest common factor of 18 and 562
The Greatest Common Factor is 18