Abacus is a wonderful mathematical instrument used for calculation. This app will help your children learn about Abacus, Numbers, Counting, Addition, …
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 …