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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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Q: What are HCF of 20 and 30?
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