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What is the HCF of 2 and 4?

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The highest common factor of 2 and 4 is 2.

The number 2 is a factor of 4.
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What is the HCF of 4 8?

To work this out, you need to break each number into its prime factors: 4 = 2x2 8 = 2x2x2 The next step is to spot any common prime factors. In this case both numbers have tw