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To find this, you first need to split the numbers down into their prime factors. In this case you get:
21 = 3x7
36 = 2x2x3x3
The next step is to identify any common prime factors. In this case the only common prime factor is 3. Therefore the HCF of 21 and 36 is 3.
The GCF is 9.
The GCF is 12.
The GCF is 4.
It is 36
36
The GCF is 18.
The hcf of 12 & 36 is 12
The hcf is 12
The HCF is: 2
The GCF is 36.