You need at least two numbers to find a GCF. If that's 3 and 7, the GCF is 1.
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The GCF is 1.
The greatest common factor between 2 numbers is the largest factor that they have in common. Therefore, the greatest common factor of 22 and 33 is 11.
The greatest common factor of 22 and 160 is 2.
The GCF is 2.
The greatest common factor of 22 and 39 is 1