Abstract
In this paper we discussd the design principles of arithmetic lessons developed by Katori who was an arithmetic teacher at Seikei-elementary school and played a great role to improve the arithmetic education at the early decade of Shyowa era. The proposed mathematics lesson was a result of his attempts to accommodate Seikatu-Sanjutu itself well to the national curriculum.
In this paper we conform that Katori used following two design principles on his lesson.
(1) Katori’s design has the cycle between children’s real life and mathematics.
(2) We find the joint between children’s real life and mathematics principle as Katori’s lesson method.
