The history of the Japanese abacus (SOROBAN). Inscriptions PL, EN, JP.

A short history of the Japanese abacus (SOROBAN) told by Karol Sieńkowski, a certified teacher and examiner of the Soroban Foundation of Japan, founder of the Soroban Academy - the Japanese Ishido-Shiki School of Mathematics in Poland.
akademiasoroba...
/ akademiasorobanu .