Factor them.
2 x 2 x 5 = 20
2 x 2 x 2 x 2 x 3 = 48
2 x 2 x 3 x 5 = 60
Select the common factors.
2 x 2 = 4, the GCF
The GCF is 4.
The GCF is 12.
12 is the GCF of 48 and 60.
The GCF is 4.
The GCF is 12.
The GCF is: 12.
The GCF of 54, 48, and 60 is 6.
The GCF is 12.
The GCF is 12.
The GCF is 12.
The GCF is 12.
The GCF is 20.