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To find the HCF of two numbers you first have to write them as their prime factors:
14 = 2x7
42 = 2x3x7
The next step is to identify any common prime factors. In this case both numbers have a 2 and a 7 as prime factors. Multiply these together and you get:
2x7 = 14
Thus the HCF of 14 and 42 is 14.
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