Indian Abacus Mental Arithmetic Education for Brain skills:The Abacus over the last 2000 years had evolved to the modern but still a manual version po …
This abacus was created by John Napier of Merchiston in 1617 for calculation of products and quotients of numbers. The method was based on Arab mathem …
Abacus is a wonderful mathematical instrument used for calculation. This app will help your children learn about Abacus, Numbers, Counting, Addition, …
Learn the Abacus and expand your brain power!The Soroban Abacus is a calculating tool in use for over 4,000 years. Abaci are often constructed as a ba …
See time in a completely original way! This digital Android clock tells time through the oldiest mathematical medium know to man--the abacus. Includes …