Mathematics actually taught at school in Japan in the two decades from 1930 to 1950 (The study of the history of mathematics 2018)

"The study of the history of mathematics 2018". September 18-21, 2018. edited by Shigeru Jochi. The papers presented in this volume of RIMS Kôkyûroku Bessatsu are in final form and refereed.In the two decades from 1930 to 1950, Japanese national curricula for schools, from elementary to post-secondary, were revised several times to cope with the rapidly changing situations both at home and abroad. Especially, the national curriculum for mathematics were revised drastically in the 1940s to cope with the situation. However, teaching of mathematics (and also other subjects) at each school according to the curriculum was impossible in the 1940s due to the war. Mathematics actually taught at school at that time was different in each school and year. This paper is a record of mathematics actually taught at school at that time