The factors of 75 are:
1, 3, 5, 15, 25, 75
The factors of 90 are:
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
The factors of 105 are:
1, 3, 5, 7, 15, 21, 35, 105
The common factors are:
1, 3, 5, 15
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The greatest common factor is 15.
The GCF is 15.
90 and 75's highest common factor is 15.
Factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 Factors of 105: 1, 3, 5, 7, 15, 21, 35, 105 GCF (90, 105) = 15
15, 30, 45, 60, 75, 90, 105 +15 . . .