UPick Subtraction is an easy, fun way to learn and practice basic subtraction.
UPick the problem set from the UPick Table, then UPick the practice screen (pick from 3 different screens).
Test your overall knowledge by picking Quiz Me Now.
Easy-to-use, with colorful visuals.
Universal app, compatible with iPhone 4, iPhone 4S, iPhone 5, iPad 2 and mini, iPod touch (3rd, 4th, and 5th generations).
Requires iOS 6.1 or later.