It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
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Since 45 is a factor of 270, it is automatically the GCF.
The greatest common factor of 15, 45 and 100 is 5.
The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.The greatest common factor of 180 and 231 is 3
The greatest common factor of 45 and 320 is 5.
The greatest common factor of 54, 5, 36, and 45 is 1.