To work this out, you need to break each number into its prime factors:
4 = 2x2
8 = 2x2x2
The next step is to spot any common prime factors. In this case both numbers have two 2s as prime factors. Multiply these together and you get:
2x2 = 4
Therefore the HCF of 4 and 8 is 4.
4
It is: 4
It is: 4
4
the hcf of 12 and 20 = 4
4
The GCF is 2.
The GCF is 4.
4
factors of 8: 1, 2, 4, 8 factors of 18: 1, 2, 3, 6, 9, 18 HCF: 2
The GCF is 2.
The HCF is 4