There are 9 factor pairs of 1044.
The GCF is 52.
The factor pairs of 104 are (104,1)(52,2)(26,4)(13,8)
1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520
The factor pairs of 416 are 1 x 416, 2 x 208, 4 x 104, 8 x 52, 13 x 32, and 16 x 26
The greatest common factor of 260 , 676 = 52