The easiest way to break it down is by recognizing the fact that 80 is divisible by 40. So just ask yourself the simple division of 4/8.
There are quite a few tips you can search that will help you out. The easiest tip (if you have to show your work) is that if both the numerator and denomonator are even, they are obviously divisible by 2. It's not the fastest way, but if you struggle with math in this area, it's a good place to start to keep it simple.
40/80 = 20/40 = 10/20 = 5/10 = 1/2
80/126 = 40/63
34/80 = 17/40
6/80 can be simplified by two so the simplest form would be 3/40.
26/80 = 13/40
54/80 = 27/40
40
80/126 = 40/63
34/80 = 17/40
6/80 can be simplified by two so the simplest form would be 3/40.
26/80 = 13/40
54/80 = 27/40
39/40
33/40
40/53
9/40
51/40
23/40