Since 30 is a factor of 90, all of its factors are common.
The greatest common factor of 90 , 30 , 45 = 15
The greatest common factor of 30, 75, and 90 is 15
The GCF of 30 and 90 is 30.
The GCF of 30, 90, and 120 is 30.
30, 60/30=2, 90/30=3
30
30?
30
30
The GCF is 30.
30 30x1=30 30x2=60 30x3=90
The GCF of 90 and 480 is 30.