Hello guys, Welcome to Africa's Largest Video Search Engine, and you are watching Abacus Mental Math Ep.4 - Adding and subtracting numbers on the Abacus without rules (中文 sub). and this video is uploaded by MissAbacus at 2020-06-28T20:01:09-07:00. We are just promoting this video only for entertainment and educational purpose only. I hop you like our Video Search Engine. [eN3eAJhPXT8]