The highest common factor of the numbers 28, 84 and 91 is 7.
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It is 7
The highest common factor of both number is 28
The highest common factor of 84, 168 and 182 is 14.
greatest common factor of 84 and 112 is 28.
You divide both parts by their highest common factor, which is 28. That gives you 2 over 3.