The GCF is 1.
210 and 420 have a GCF of 210.
Since 210 is a factor of 420, it is automatically the GCF.
The GCF is 42.
The GCF is 70.
The GCF is 105.
The GCF is 6.
The GCF is 14.
The GCF is 6.
The GCF is 15.
The GCF is 14.
The GCF of 210 and 450 is 30.
The GCF for 210 126 is 42.