17 Digits Rods Soroban Standard Abacus Chinese Japanese Calculator Counting Tool

✔ is a calculating tool that was used for centuries before the adoption of the written modern numeral ✔ The abacus is still widely used by merchants, traders and clerks in certain parts of the world such as Asia and Africa. ✔ In addition to being a professional tool, the soroban or abacus is also an educational tool. ✔ People who become proficient in the use of the abacus almost automatically become adept at mental calculation. ✔ Its classical, standard allows for its ease of use as a professional and educational tool.