29:31

What's My Favorite Abacus?

18:40

The Abacus - Part 1

4:16

Different Types of Abacus - Chinese Suanpan - Japanese Soroban - Russian Schoty

21:37

The Abacus - Part 6

16:00

The Abacus - Part 3

5:49

The Abacus - How to Use This Ancient Wonder

3:29

Abacus Tutorial: 1 Basic function

8:31

Abacus Lesson 1 // Introduction, Proper Technique, & History of the Abacus // Tutorial