Khan Academy the popular site for learning anything through educational videos, has just released a big update to their free iOS app. Version 2.0, now includes over 150,000 Math exercises that are aligned to Common Core Standards. Also, there is a sketch pad that allows users to work out their problems and take notes. Best of all, a the app syncs w/ the web version so a person can continue where they left off from any device.
I highly recommend checking out the Khan Academy app by clicking here!!!
For a more detailed review click here.