80 over 84 simplified = 20/21
65/84 cannot be simplified.
it is 3
126/12 = 21/2 or 10.5
It is: 78/126 = 13/21 simplified
1 over 9
2 and 11/84.
1/2
It is: 126/162 = 7/9 simplified
It is 63/126 = 1/2 simplified
It's 14 over 15.
(2/3)*126 = 2*126/3 = 84