Since 210 is a factor of 420, it is automatically the GCF.
The GCF is 12.
The GCF is 35.
The GCF is 60.
The GCF is 12.
The GCF is 84.
The greatest common factor (GCF) of 420, 616 and 2184 is 28.
The GCF is 30.
The GCF is 105.
The GCF is 70.
The GCF is 105.
210 and 420 have a GCF of 210.