17 Digit Rods Standard Abacus Soroban Chinese Japanese Calculator Counting Tool Math

✔ The abacus is a calculating tool that was used for centuries before the adoption of the written modern numeral system. ✔ 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 abacus is also an educational tool. ✔ The abacus is widely used in teaching children counting and mathematics. ✔ People who become proficient in the use of the abacus almost automatically become adept at mental calculation.