This Math Subtraction Flash Cards app includes 78 cards and provides an easy approach for building math subtraction skills. Each card displays a subtraction problem from 2-1 through 24-12. The cards are divided into 2 groups (25 cards with number up to to 10 and 53 cards with numbers greater than 10). Tapping the Answer button will show the student the answer to the problem. This application is completely self-contained and does not require internet connection except for emailing the "Recommend This App". It is an excellent tool to use by the individual student or for an entire class. Compatible with most Android phone and tablet devices.