The GCF is 12.
The GCF is 72.
The GCF is 72.
The GCF is 60.
The GCF is 84.
The GCF is 35.
The GCF is 12.
Since 210 is a factor of 420, it is automatically the GCF.
The GCF of 380, 420 is 20.
The GCF is 12.
The GCF of 180, 420 and 450 is 30.
gcf(20, 420) = 20