Well, darling, the highest common factor of 77 and 217 is 7. It's as simple as that. No need to complicate things, honey. Just remember to keep it sassy and straightforward, okay?
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It is 7
The GCF is 7.
Express each number in terms of its prime factors. 77 = 7 x 11 259 = 7 x 37 The only common factor and therefore the highest common factor is 7.
Their highest common factor is 7, so divide both by that to give 2 out of 11.
Greatest common factor of 77 and 121 is 11.