The factors of 9 are 1, 3 and 9. For them to be common, they need to be compared to another set of factors.
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The greatest common factor of 9 , 8 = 1
The greatest common factor of 5 and 9 is 1.
3 is the greatest common factor of 9 and 12.
The Greatest Common Factor (GCF) is: 9
The greatest common factor of 27 and 36 is 9.