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The easiest way to do this is to split the numbers down into their prime factors:

14 = 2x7

20 = 2x2x5

The next step is to spot any common prime factors. In this case both numbers have a 2 as a prime factor. Therefore, the HCF of 14 and 20 is 2.

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Q: What is the HCF of 14 and 20?
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