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21=3x714=2x77 is the greatest common factor
2, 4, 8, 21, 24, 63 126, 252
21% of 8= 21% * 8= 0.21 * 8= 1.68
8 - (-21) = 8 + 21 = 29
21 goes into 126 6times 21 goes into 189 9times gcf =21