The GCF is 6.
The GCF is 2.
8
20 and 24's highest common factor is four.
Since 8 is a factor of 24, it is automatically the GCF.
3
The GCF is 6.
The GCF is 12.
The GCF is 6.
The GCF is 3.
The GCF is 12.
24 - 1 = 23
8, whether you meant 3224 or 32 and 24.