The factors of 12 are 1, 2, 3, 4, 6, 12
The factors of 28 are 1, 2, 4, 7, 14, 28
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28
28.
The GCF of 8, 12, and 28 is 4 The greatest common factor is the highest number that divides exactly into two or more numbers The factors of 8 are 1, 2, 4, and 8 The factors of 12 are 1, 2, 3, 4, 6, and 12 The factors of 28 are 1, 2, 4, 7, 14, and 28 So the GCF of 8, 12 and 28 is 4.
The common factors are: 1, 2, 4
1 + 2 + 3 + 4 + 6 + 12 = 28