It is 12.
Beacause the factors of 36 are: 1,36,3,12,4,9,6
and the factors of 84 are: 1,84,7,12
12 is the highest factor that both numbers have in common.
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The greatest common factor of 630 , 84 = 42
It is 7
The GCF of 28 and 84 is 28.
Since 28 is a factor of 84, it is automatically the GCF.
The GCF is 7.