20 = 10 · 2 = 5 · 2 · 2
28 = 14 · 2 = 7 · 2 · 2
GCF(20, 28) = 2 · 2 = 4
Factors of 20: 1, 2, 4, 5, 10, 20
Factors of 28: 1, 2, 4, 7, 14, 28
The greatest common factor of 20 and 28 is 4.
Hope this helps!
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-Charlie
