1 Strange. 2  The people in the Red table are looking to buy this item for the price listed. 3  The people in the Blue table have the item and are willing to sell it for the price listed. 4  The top of the table is the best price (highest bid / lowest ask).
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.
Example: Find the GCF of 18 and 27 The factors of 18 are 1, 2, 3, 6, 9, 18. The factors of 27 are 1, 3, 9, 27. The common factors of 18 and 27 are 1, 3 and 9. The greatest common factor of 18 and 27 is 9. Example: Find the GCF of 20, 50 and 120 The factors of 20 are 1, 2, 4, 5, 10, 20. The factors of 50 are 1, 2, 5, 10, 25, 50. The factors of 120 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120 The common factors of 20, 50 and 120 are 1, 2, 5 and 10.