greatest common factor of 19 and 76
The prime factors of 76 are 2, 2, and 19. There are no prime factors in common, so the numbers are relatively prime, which means the greatest common factor is 1.     Factors of 45: 1 3 5 9 15 45   Factors of 76: 1 2 4 19 38 76   The GCF of 45 and 76 is 1       1   The Greatest Common Factor is 1.