Don't bother. Since 25 is a factor of 75, it is automatically the GCF.
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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).
No. 25 is a factor of 75 and 75 is a multiple of 25.
Here 25 divides 75 so, GCF of 25 and 75 is 25.
Yes.
25 is the greatest common factor of 75 and 25. 3 x 25 = 75.