The factors of 80 are 1, 2, 4, 5, 8, 10, 16, 20, 40, and 80.
Positive factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60.
Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30.
The positive factors of 63 are 1, 3, 7, 9, 21, and 63.
The positive factors of 56 are 1, 2, 4, 7, 8, 14, 28, and 56.