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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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13y ago
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7y ago

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

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13y ago

greatest comon factor for 45 and 90 is 45.

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13y ago

The Greatest Common Factor (GCF) is: 15.

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11y ago

The GCF is 15.

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11y ago

The greatest common factor of 2 , 45 = 1

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