The greatest common factor, or GFC, is 2.
The factors of 6 are 6, 3, 2, and 1.
The factors of 20 are 20, 10 ,5 ,4 ,2, and 1.
The largest factor common to both numbers is 2.
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1 and the highest common factor is 6
6 is the highest common factor 6*7 = 42 6*9 = 54
6
3
It is 3