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.
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