Because 4 is the largest positive integer that will divide evenly into both of those numbers with no remainder.
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Since 4 is a factor of 20, it is automatically the GCF.
The GCF is 4.
The GCF of 12, 20, and 36 is 4.The GCF is 4.
You need at least two numbers to find a GCF.
The GCF is 4.