The GCF is 4.
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The HCF of 20 and 24 is 4.
The HCF of 16 and 20 is 4
To find the hcf, first split the numbers into their prime factors: 20 = 2x2x5 16 = 2x2x2x2 The next step is to identify any common prime factors. In this case both numbers have 2 and 2 as prime factors. Multiply these together and you get 4. Thus the hcf of 20 and 16 is 4.
The answer is 4 and 10.
5 (leaves you with 2, 4 and 7)