4 and any multiple of 4 have a GCF of 4.
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The Greatest Common Factor of 4 and 88 is 4. There are no further divisible numbers in common, aside from 1. You are left with 1 and 22 respectively.
The Greatest Common Factor of 4 and 7 is 1. There are no divisible numbers in common, aside from 1.
To find the GCF of two numbers you first need to split them both into their prime factors. For 52 and 4 these are: 52 = 2x2x13 4 = 2x2 The next step is to identify any common factors. In this case, both numbers have two 2s as factors. To find the GCF you take these common prime factors and multiply them: 2x2=4. Thus the GCF of 52 and 4 is 4.
The GCF is 1 - since 13 is a prime number.