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The product is 126
The factor pairs of 126 are: 1 x 126 2 x 63 3 x 42 6 x 21 7 x 18 9 x 14
7/8 of 18 = (7 x 18)/8 = 126/8 = 15.75 or 1/8 of 18 = 18/8 = 2.25 2.25 x 7 = 15.75
7
The LCM of 21 and 18 is 126.