$0.99 from Webvantage Design
Version 2.0 now available with 70 Subtraction problems! That is DOUBLE the Math fun from version 1.
Subtraction Helper is an educational tool to help elementary grade school students practice their basic Math skills. We all know how important Math is for a child to succeed in school, and of course the more Math practice the better! Now you can practice with this neat little app that will reveal the answers when you click on the problem. Your child will have fun learning on your iPhone and iPod Touch!!