Since 18 is a factor of 72, it is automatically the GCF.
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The Greatest Common Factor is 18
The GCF is 9.
The Greatest Common Factor of 18, 36, and 72 is 18. Since 18 is a factor of 36 and 72, it is automatically the GCF.
The greatest common factor of 88 and 72 is 8.
The GCF is 9.