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To work this out, you first need to put both numbers as their prime factors:

12 = 2x2x3

33 = 3x11

The next step is to identify any common prime factors. Both numbers have a 3 as a prime factor. Therefore the HCF of 12 and 33 is 3.

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13y ago

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Q: What is the HCF of 12 and 33?
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