The GCF of consecutive integers is 1.
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The GCF is 9.
The GCF of 27 and 99 is 9 3 x 9 = 27, 11 x 9 = 99
The GCF of 99 and 121 is 11
It's the same as gcf(gcf(75, 100), 175). In other words, you can first use Euclid's algorithm to find the gcf of 75 and 100; then you can calculate the gcf of the result with 175. To help you get started, by Euclid's algorithm, the gcf of 75 and 100 is the same as the gcf of 75 and 25 (where 25 is the remnainder of the division of 100 / 75).
If the GCF of 11 and x is 1 and the LCM of 11 and x is 99, x= 9.