The greatest common factor of 30.48.60

30 = 3*10

30 = 3*2*5

48 = 12*4

48 = 3*4*4

48 = 3*2*2*2*2

60 = 3*20

60 = 3*10*2

60 = 3*2*5*2

The GCF is 3*2 because all 3 numbers contain a 3 and a 2 in their prime factorizations.

Final answer: 6