1). Write factors of each no.
8=2×2×2
12=2×2×3
20=2×2×5
2).Then pick out the common factor in each
HCF of 8,12,20=2×2=4
the hcf of 12 and 20 = 4
The GCF is 2.
Since 12 is a factor of 24, it is automatically the GCF.
4
4
4
12
4
It is: 4
The GCF is 4.
The GCF is 2.
The GCF of 12 and 20 is 4.