It is 13
1, 3, 13, 39 1, 11, 13, 143 1, 13, 169
It is: 13
It is: 13
The GCF is 13.
The GCF is 13.
The GCF is 13.
The GCF is 13.
It is: 13
1 and 13
It is 13
The GCF of 39, 143, and 169 is 13. One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them. The factors of 39 are 1, 3, 13, and 39. The factors of 143 are 1, 11, 13, and 143. The factors of 169 are 1, 13, and 169. The common factors are 1 and 13. Therefore, the greatest common factor is 13.