Addition Trainer Lite provides kids to train elementary level of additon skill. It will ask addition questions randomly ranging from 1 digit + 1 digit, 1 digit + 2 digits and to 2 + 2 digits but answers within 2 digits. How to use: 1. Press "START! " button. 2. Enter solution by numbers. (If you enter wrong number, press "C" to clear the entry. ).