Hatsubi Calculation Method

This is he only publication issued by the wazan scholar Tkkazu Seki (? - 1708) during his lifetime. This book provides answers to the 15 questions proposed by Kazuyuki Sawaguchi in his book Kokin Sanpoki (1671). Over the 25 years since the publication of Kinkoki, the complexity of wazan problems far exceeded the realm of elementary arithmetic where promlems could easily be solved using the abacus. For problems shich in present days would use algebraic equations, Siki applied Fukudai which was developed from the traditional Chinese calculation method Tengen jyutsu.