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Wiki User
To find the HCF you first need to break the numbers down into their prime factors. In this case you'd get:
3 = 3
15 = 3x5
The next step is to identify any common prime factors. In this case, the only common prime factor is 3. Therefore the HCF of 3 and 15 is 3.
The GCF is 3.
3
9 & 15
HCF is the highest common factor of two or more numbers. HCF of 9 and 15 is 3.