Digital Abacus Calculator is a simple app that designed to learn how to use abacus virtually. With digital display will help to understand how to place beads of abacus. You can use this app for assist how to use abacus or to make calculation on it. Please try and have fun! Requirement: -need android device that have RAM more than 1G Tested on: Samsung Grand 2 Huawei Y336 Lenovo A3300