The number in the question is rational. It is not at clear how a rational number can be rationalised!
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As a product of its prime factors in exponents: 22*53 = 500
The GCF is 5.
The Greatest Common Factor (GCF) is: 20.
The greatest common factor (GCF) is: 20
Answer:The greatest common factor of 100 and 500 is 100.The common factors of 100 and 500 are 1, 2, 4, 5, 10, 20, 25, 50, and 100.Method:Since 100 is a factor of 500 and it is also the largest factor of itself, it must be the greatest common factor. Since the greatest common factor is 100, the common factors are all the factors of 100.