,25/,5 x 100/100 = 25/50 = 1/2

Why was that hard?

100/100 = 1, because any number divided by itself is 1.

And any number multiplied by 1 is still that number.

TBH, I moved the decimal over 2 places on the numerator and denominator and simplified 25/50 to 1/2 because It is easier to do in my head. Some of the other paths are too complicated when I am going to sleep.