الآراء
The Abacus Squared App
How to use an Abacus App for Math Operations?
Introduction to Mental Abacus App -- Your springboard
Abacus from basics || Abacus Lesson 1 || Introduction.
Abacus Demo at Advance level by Ritwik Sinha ! Watch the effort !!
Abacus Tutorial: 4 The exchange method -calculating up to 10 and more
How to add in Abacus || Abacus Addition || Abacus Lesson 2
The Japanese Soroban Abacus, Part 2: Addition