The factors of 86 are:
1, 2, 43, 86
The factors of 129 are:
1, 3, 43, 129
The factors of 215 are:
1, 5, 43, 215
The common factors are:
1, 43
The Greatest Common Factor (GCF) is: 43
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The GCF is 43.
The greatest factor is 86 which is a factor of 86, though not of 44. The greatest COMMON factor, though not requested, is 2.
The Greatest Common Factor (GCF) of the numbers 129,133,215 is 1 because 1 is the greatest number that divides evenly into all of them.
43, 86, 129, 172, 215, 258, 301, 344 +43 . . .
1, 2, 3, 5, 6, 10, 15, 30, 43, 86, 129, 215, 258, 430, 645, 1290.