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Associativity FTW
Commutivity.
My brain has to work hard at it, but this should be the derivation, right? No parens needed because x and / are commutative operators, right?

.08 x 25 => 8 / 100 x 25 => .08 x 100 x 25 / 100 => 8 x .25
i think of it as 8/100 * 25/1 = 25/100 * 8/1
you just move the numerators around
yes much simpler.
Yes yes. But how to type that into your fav calculator app? Now you're dumb again 😜
Also, i just noticed, you can move the decimal place from .08 x 25 = 8 x .25
Well, OK, both really:

x% of y
Rewrite: (x * (1 / 100)) * y
Associativity: x * ((1 / 100) * y)
Commutativity: x * (y * (1 / 100))
Commutativity: (y * (1 / 100)) * x
Rewrite: y% of x
"Also, i just noticed, you can move the decimal place from .08 x 25 = 8 x .25"

That was how I thought about it, @Will (new account).