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To find the HCF of 20 and 30, break them down into their prime factors:
20 = 2x2x5
30 = 2x3x5
The next step is to identify any common prime factors. In this case both numbers have a 2 and a 5 as prime factors. Multiply these together and you get:
2x5 = 10
Therefore the HCF of 20 and 30 is 10.
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