Practice Abacus with this APP to improve your Calculation/Abacus Skills, Following Modules with multiple options are included in this APP - Addition/Subtraction - Multiplication - Long Multiplication - Division - Decimals - Square Root - Cube Root - Time Practice - Listening Practice WHAT IS ABACUS Abacus, a mental math concept is a brain development program that originated in Japan. By learning abacus anyone can solve complex calculations on fingers in fraction of seconds. This app is used