315/21 = 15, hence 15 times 21 is 315
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It is: 2 times 315 equals 630
21% of 315= 21% * 315= 0.21 * 315= 66.15
1 x 315, 3 x 105, 5 x 63, 7 x 45, 9 x 35, 15 x 21, 21 x 15, 35 x 9, 45 x 7, 63 x 5, 105 x 3, 315 x 1
5p2 = 315 Therefore, p2 = 315/5 p = sqrt(63) p = ±7.94
28*21 equals 84