405
5*81
5*9*9
5*3*3*3*3
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The greatest common factor of 288 and 405 is 9.
The factor pairs of 51 are (1,51) and (17,3)
The GCF/HCF of 486 and 405 is 81.
The difference is between factor pairs and distinct factors. With square numbers, one of the factor pairs will be the same number twice. When listing the distinct factors, that number is only listed once.
The factor pairs of 98 are (1,98), (2,49), and (7,14).