say we ask the question, 8 is what percent of 32. We can throw these into an equation that looks lime this. X/100=Y/Z, X in this case is 32 because it is the full 100% and we want to find what percent Y (8) is of it. Basically solving for Z.
So plugging in the numbers,
32/100=8/Z cross multiply, 800=32z in this problem we get that 8 is 25% of 32.
That value makes sense so it must be correct. Let me know if you're still confused.