Only 3, since 57 does not divide by either 2 or 6.
Factors of 57: 1, 3, 19, 57 Factors of 6: 1, 2, 3, 6 GCF (57, 6) = 3
Factors of 18 are 1, 2, 3, 6, 9 and 18. Factors of 57 are 1, 3, 19, and 57. The GCF of 18 and 57 is 3.
The factors of 6 are: 1, 2, 3, 6 The factors of 57 are: 1, 3, 19, 57
The common factors of 27 and 57 are 1 and 3
Common factors of 57 and 93 are: 1 and 3.
Common factors of 12 and 57 are: 1 and 3.
The factors of 57 are:1, 3, 19, 57The factors of 84 are:1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84The common factors are:1, 3
Both 1 and 19 can divide into both 19 and 57.
The factors of 12 are: 1, 2, 3, 4, 6, 12The factors of 57 are: 1, 3, 19, 57The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3
27 and 57 have two common factors: 1, 3.
The factors of 57 are 1, 3, 19, and 57The factors of 18 are 1, 2, 3, 6, 9, and 18
Since 6 = 2x3, 57 = 3x19 and 99 = 3^2 x 11, the GCF is 3. This method used comparing the prime factors to determine the greatest common factor. The only common prime factor all three numbers have is 3, so it is the greatest common factor. Another, less efficient, way to determine the greatest common factor is to find all the factors of the numbers and compare them. The factors of 6 are 1, 2, 3, and 6. The factors of 57 are 1, 3, 19, and 57. The factors of 99 are 1, 3, 9, 11, 33, and 99. From this you can again see that the greatest common factor is 3.