28/4=7
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1, 2, 4, 7, 14 and 28 are its factors, so it has six factors.
The GCF is 7.
The answer is 28 because 28 x 1 = 28
Half of the divisors of 28 will be less than the square root, half greater. The square root of 28 is between 5 and 6. So all we need to do is test the numbers 1 to 5 to see if any of them are factors. 1 is because 1 is a factor of everything. 2 is because 28 is even. 3 is not. 4 is. 5 is not. Divide 1, 2 and 4 into 28 The factors of 28 are 1, 2, 4, 7, 14, 28
The factors of 28 are 1, 2, 4, 7, 14, and 28 The factors of 35 are 1, 5, 7, and 35 The common factors of 28 and 35 are 1 and 7