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.
For instance, the greatest common factor (GCF) of 15 and 25 is 5, because 5 is the largest number that goes into 15 and 25 evenly. To find the GCF of small numbers, like 12 or 16, it might be easier to just list all the factors and find the largest common factor, but for big numbers like 490 and 819, you need a faster method. The first step is to complete a prime factorization of each number.