The product of 27 times 54 is 1458
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(18 + 36) + (45 - 27) = 54 + 18 = 72
1 and 54, or 2 and 27, or 1/54 and 2916 or an infinite other pairs.
-27 and -2
9, 18, 27, 36, 45, 54.
18 + 36 + 45 + 9 + 9 + 54 + 27 + 72 + 81 = 351