A new article is available by Rosalie Hosking, Tsukane Ogawa, and Mitsuo Morimoto in the online periodical MAA Convergence regarding wasan.
You can read this article here. Here is the abstract:
Elementary Soroban Arithmetic Techniques in Edo Period Japan
In this article, we introduce methods for doing basic arithmetic on the Japanese abacus – known as the soroban – as used during the Edo period (1603–1868 CE). Our instructions are informed by the first two books of the Taisei Sankei(Great Accomplishment of Mathematics), a mathematical work compiled by Seki Takakazu (d. 1708) and his students, the brothers Takebe Katahiro (1664–1739) and Takebe Kataakira (1661–1716), between 1683 and 1711 CE.
The soroban was the most common tool for calculation during the Edo period, used by merchants, farmers, and mathematicians alike to calculate everything from the cost of exchanging silver into gold to calculating the value ofIn this article, we will introduce the common techniques for doing basic arithmetic on the soroban in the traditional style, so modern students, mathematicians, and historians alike can see how this device was used for over 250 years in Japan. We also provide a series of exercises in Section III for those who wish to try applying the techniques to traditional Edo period problems.