Answer:
4
Step-by-step explanation:
We need to find the greatest common factor aka (GCF)
Factors of 28: 1, 2, 4, 7, 14, 28
Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 8: 1, 2, 4, 8
The factor that they all have is 4 so 4 is our answer :)
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