Answer: 1
Since 5 is a Prime number, the only possible common factors are 1 and 5. 32 is not divisible by 5, so the only common factor is 1, which is thus the greatest common factor.
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The GCF is 5.
The greatest common factor of 5 and 5 is 5.
The greatest common factor of 20 and 65 is 5.
The greatest common factor of 5 and 9 is 1.
The Greatest Common Factor (GCF) of 5 and 90 is 5