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To find the HCF of two numbers you first have to express them as a product of their prime factors. In this case:
15 = 3x5
39 = 3x13
The next step is to identify any common prime factors. In this case, both numbers have 3 as a prime factor. Therefore the HCF of 15 and 39 is 3.
39
The HCF of 39 and 20 is 1
The GCF is 15.
The GCF is 13.
3
1
156: Hcf of 13 and 39= 13 13*12=156 =156
It is 13
It is: 13
hcf(5, 15) = 5 lcm(5, 15) = 15.
The GCF is 5.