The factor pairs of 128 are (128,1), (64,2), (32,4), and (16,8)
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The factor pairs of 57 are 3x19 and 1x57
The factor pairs of 343 are (343,1) and (49,7)
Since 8 is a factor of 128, it is automatically the GCF.
20 has 3 factor pairs. Pairs are (1,20), (2,10) and (9,9)
The factor pairs of 12 are (12,1), (6,2), and (4,3) The factor pairs of 18 are (18,1), (9,2), and (6,3)