The GCF is 14.
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As there is no common factor between any of the numbers other than 1, LCM(5, 7, 10, 11) = 5 × 7 × 10 × 11 = 770
770= 10 x 77 ^ ^ 5 2 11 7
The LCM is 770.
180 = 2 x 2 x 3 x 3 x 5 770 = 2 x 5 x 7 x 11 Common factors 2 & 5 so HCF = 2 x 5 ie 10.
The common factors of 660 and 770 are: 1, 2, 5, 10, 11, 22, 55, and 110