21. GCF means what is the greatest number that goes into both, and 21*2=42.
21 itself is the greatest common integral factor, since 21 X 2 = 42.
The common factors of 21 and 42 are 3, 7 and 21. The greatest common factor (GCF) is 21.
The GCF is 21.
Since 21 is a factor of 42, it is automatically the GCF.
The GCF is 21.
It is: 21
It is: 21
The GCF is 6.
The GCF of 42 and 273 is 21. 42 = 2 x 21 273 = 13 x 21
The GCF is 21.
The GCF is 21.
The Greatest Common Factor is 21