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20=2x2x5
45=3x3x5
75=3x5x5
GCF=5

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Wiki User

14y ago
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Wiki User

6y ago

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! The greatest factor of any number is itself.

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Wiki User

8y ago

The GCF is 5.

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Wiki User

7y ago

The GCF is 15.

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Wiki User

6y ago

The GCF is 5.

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Q: What is the greatest common factor of 15 45 and 75?
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