The GCF is 7.
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The highest common factor for 133 and 161 is 7.
It is: 11
The HCF of 28 77 and 91 is 7, since 7 goes into all the numbers and all the numbers above it dont.
The GCF is 7.
Divide numerator and denominator by their HCF eg 35/77: HCF is 7 so simplifies to 5/11.