How to find greatest common factor  45 and 81

Find the common factor and then choose the greatest (biggest one)

45= 3,5,9,15,45

81= 3,9,27,81

The common factors are 3 and 9
The greatest common factor (GFC) is 9 

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Answer:  9

Step-by-step explanation: what is the greatest number that they can be multiplied by



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