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To find the highest common factor of two numbers you first need to break them down into their prime factors. In this case:

24 = 2x2x2x3

28 = 2x2x7

The next step is to identify the common factors. In this case, both numbers have two 2s as a factor. We multiply these together to get the HCF:

2x2=4

Thus 4 is the highest common factor of 24 and 28.

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13y ago

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