The greatest common factor of 54, 5, 36, and 45 is 1.
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The greatest common factor of 45 and 320 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
Since 45 is a factor of 270, it is automatically the GCF.
The Greatest Common Factor of 20, 35, 50: 5
There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.