because its the highest number that divides into them all evenly.
91/7 is 13, 112/7 is 16, 49/7 is 7
So 13, 16 and 7 do not have anything else in common
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Because 7 is the largest positive integer that divides evenly into all of those numbers with no remainder.
HCF is the highest common factor of two or more numbers. HCF of 56 and 49 is 7.
7
If you mean: 21, 49 and 84 then the HCF is 7
The GCF is 7.