It is very efficient and explains to you, in a very neat fashion by the way, how to solve it, this is a verryyyy good app, it is accurate, a real lifesaver indeed for understanding math homework. Good math helper. Teachers may say that using this is cheating, but honestly if you look a little closer, it's so much easier to understand math if you look at how they did it! I have learned math through this app better than my teacher explaining it 200 times over to me.