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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.
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What is the HCF of 4 and 8?
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What is the HCF of 8 and 28?
Oh, dude, the Highest Common Factor (HCF) of 8 and 28 is like the coolest number that can divide both of them without leaving a remainder. So, for these two numbers, the HCF is 4 because 4 is the largest number that can divide both 8 and 28 evenly. Like, that's math for you, man.
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