90 and 180, among others.
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The GCF of 75 and 90 is 15.
the answer is 45 90 and 60
If the GCF of two numbers p and q is 7, then the GCF of p2 and q2 is 14.
Prime and relatively prime numbers all have a GCF of 1.
It doesn't matter what you use, you still need at least two numbers to find a GCF.