The GCF of 21, 77, and 84 is 7.
First you have to find the lowest common factor, that is able to be divided by all the numbers.
E.g. 7
*21/7=3
*77/7=11
*84/7=12
3 and 11 are prime numbers and can therefore not be any divided further. Therefore the answer is 7.
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The greatest common factor of 21 and 77 is 7.
Greatest common factor of 33 and 77 is 11.
2 is the Greatest common factor.
1.
97