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To find this, you first have to split the numbers into their prime factors:
18 = 2x3x3
54 = 2x3x3x3
The next step is to identify any common prime factors. In this case both numbers have a 2 and two 3s as prime factors. Multiply these together gives you:
2x3x3 = 18
Therefore the HCF of 18 and 54 is 18.
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