Factor them.
2 x 2 x a = 4a
2 x 5 x a x a = 10a2
Select the common factors.
2 x a = 2a, the GCF.
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The GCF is 4a.
The GCF is 4.
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32a + 8= 8(4a+1)
To find the highest common factor of two numbers, you must first split them into their prime factors. In this case, the numbers 28 and 32 can split as follows: 28 = 2x2x7 32 = 2x2x2x2x2 The next step is to identify all common prime factors. In this case, the common prime factors are two 2s. To find the HCF, you just multiply these together: 2x2=4 Thus the highest common factor of 28 and 32 is 4.