The word percent means divided by

Its so easy to use, there is nothing wrong with this app. Pre-Algebra, regular Algebra, Pre-Cal, Calculus, Statistics, Trig, etc, little hard to understand some ways to solve, but that's no fault of the app itself, just my lack of understanding for some terms.

But, why do we need to suscribe?now thats the part that i do not like, i like how the unpaid version has zero ads and unlimited help, it can be very useful to solve equations and stuff but it's too specialised on that.