The common factors are: 1, 2, 3, 6.
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The least common multiple of 42 and 126 is 126.
GCF(36, 42, 72) = 6
The GCF of 36, 42, and 54 is 6.
The GCF is 3.
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.