What proprety shows that 2/5 x 1 = 40/100

Commutative Property.

It cannot be multiplication property because it would have to be live 5 x 1 = 5. For multiplication property the answer has to be the same as the number you used to get the answer. Does that make sense? I can send you a pic if you need it. I might be wrong because I just learned it now so I could give you an answer but from the example I got it has to be like 25x1=25, 100x1=100 something like that