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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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13y ago

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