5/4 + 7/12 =
22/12
20/42 =
10/21
3/9 =
9/27
15 2/4 =
31/2
8/6 + 20/42 =
84/42
30/24 =
5/4
8/10
64/80
9 6/9 =
24/5
Press F11 Select menu option View > Enter Fullscreen for full-screen mode