21*42=882
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21 x 42 = 882
The answer is 42. 6 x 7 equals 42. 21 x 2 equals 42.
42 = 21 x 31 x 71 126 = 21 x 32 x 71 210 = 21 x 31 x 51 x 71 Take the lowest power of the common primes: hcf of 42, 126 & 210 is 21 x 31 x 71 = 42.
1 x 42, 2 x 21, 3 x 14, 6 x 7, 7 x 6, 14 x 3, 21 x 2, 42 x 1 = 42
7 3 x 7 = 21 6 x 7 = 42