1, 2, 4, 5, 8, 10, 16, 20, 40, 80
1, 3, 9, 27, 81
1, 2, 41, 82
1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
1, 5, 17, 85
The factors of 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 The factors of 81 are: 1, 3, 9, 27, 81 The factors of 82 are: 1, 2, 41, 82 The factors of 84 are: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
1, 2, 37, 74 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 1, 3, 9, 27, 81 1, 2, 41, 82 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 1, 5, 17, 85
80, 81, 82, 84, 85, 86, 87, 88, 90
80, 81, 82, 84, 85, 86, 87, 88, 90
81, 82, 84, 85, 86, 87, 88
81, 82, 84, 85, 86, 87, 88. 80 and 90 are composite too
.81 .82 .83 .84 .85 .86 .87 .89
The numbers are 81, 82 and 83. Also, 80, 82 and 84
The numbers between 80 and 85 are 81, 82, 83, and 84. The number that is exactly halfway between 80 and 85 is 82.5
80, 81, 82, 84, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100.
80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100
The factors of 82 are 1, 2, 41, and 82. The factors of 84 are 1, 2, 4, 6, 7, 12, 14, 21, 42, and 84. The factors they have in common are 1 and 2.