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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.

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45

Since 45 is a factor of 90, it is automatically the GCF.

greatest comon factor for 45 and 90 is 45.

The Greatest Common Factor (GCF) is: 15.

The GCF is 15.

The greatest common factor of 2 , 45 = 1

Q: What is the greatest common factor of45 and 75?

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The greatest common factor of 75 and 112 is 1.

The GCF of 75 and 99 is 3.

The greatest common factor of 75 and 27 is 3.

The Greatest Common Factor of 75, 115, 150: 5

The greatest common factor of 75 and 125 is 25

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greatest common factor of 75, 195, and 325.

The GCF of 75 and 99 is 3.

The greatest common factor of 75 and 27 is 3.