"The Education category of the App Store features an overwhelming number of apps, great for both parents and teachers.
Each subject search displays a diverse and colorful selection of apps to cover just about anything you’ll be adding to your digital curriculum. However, with so many choices, it’s hard to discern a download-worthy app from the next. (A simple search for math apps yielded well over 200 results.) Here is a list of educational iPad apps by subject matter that you may not have heard of before, but are certainly worth a look."