Needs more challenge

I would give this app a five star, but its too easy to master. It would be nice if the problems became more challenging the more one plays. Also, it would be great if there was more explanation in regard to why fractions are created instead of addition or subtraction when separating the veritable then moving the whole number to the other side of the equal sign. All in all this is an awesome app, and I love to play it.

urkillinmedolly about Algebra Touch