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TO work out the HCF you need to split the numbers into their prime factors. In this case you have:

40 = 2x2x2x5

48 = 2x2x2x2x3

The next step is to identify any common prime factors. Both numbers have three 2s as prime factors. Multiply these together and you get:

2x2x2 = 8

Thus the HCF of 40 and 48 is 8.

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Q: What is the HCF of 40 and 48?
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