Factor out each term to get:
126 = 3 x 42
= 3 x 3 x 14
= 3² x 2 x 7
168 = 4 x 42
= 2² x 3 x 2 x 7
= 2³ x 3 x 7
210 = 10 x 21
= 2 x 5 x 3 x 7
So the GCF is 2 x 3 x 7 = 42 since that is the greatest multiple that divide 126, 168 and 210..
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The GCF is: 42
42, 84, 126, 168, 210
42, 84, 126, 168, 210, 252, 294, 336, 378, . . .
168 is 80% of 210.
21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, 273, . . .