You need at least two numbers to find a GCF.
8
15% of 80 is 12
80*0.12 = 9.6
If you mean: 80/150 then it is 8/15 when reduced
1, 2, 4, 5, 8, 10, 16, 20, 40, 80
The GCF is 6.
The GCF is 9.
The GCF is 4.
The GCF is 30.
50
The GCF of 125, 200 is 25.
The GCF is 3.