It is: 4
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The greatest common factor of 20, 28, and 24 is 4.
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.
The greatest common factor of 7 and 28 is 7.
The greatest common factor of 28 and 120 is 4.
The least common factor of 8 and 28 is 2.