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To calculate the GCF you first have to split the numbers into their prime factors:
28 = 2x2x7
12 = 2x2x3
20 = 2x2x5
The next step is to identify any common factors. In this case, all three numbers have two 2s. Multiply these together and you get 4. Therefore the GCF of 28, 12 and 20 is 4.
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