Math helper is a great app that helps you learn and practice math skills. This fantastic app has loads of math subjects to choose from. From arithmetic to fractions, decimals to word problems, this app would give you tons of information on all the different math subjects. With funny and descriptive pictures, this app would give you all the info and entertainment you need. And did I mention that it doesn't need Wifi or 3G to operate, works on all versions of iPhone and is free?