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There are no common factors between 15 and 19 aside from 1. This means that the GCF is 1.
The factors of 60 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 The factors of 76 are: 1, 2, 4, 19, 38, 76 The common factors are: 1, 2, 4
The common factors are: 1, 19
The factors of 19 are: 1, 19 The factors of 76 are: 1, 2, 4, 19, 38, 76 The common factors are: 1, 19 The Greatest Common Factor: 19
The common factors are 1 and 19