Best Answer

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 two 2s as prime factors. Multiply these together and you get:

2x2 = 4

Therefore the HCF of 4 and 8 is 4.

Q: What is the HCF of 4 8?

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