The abacus also known as a counting frame, is a calculating tool that was in use hundreds of years prior to the adoption in the written fashionable numeral procedure and remains greatly used by retailers, traders and clerks in Asia, The Japanese abacus is known as the soroban. Even though http://abacuscoaching67788.designi1.com/19161032/examine-this-report-on-abacus-abacus-frame