标题：117,118 幼児の数概念の発達とその教育(1)(3.発達(2),日本教育心理学会第5回総会部門別研究発表要旨・討論の概要) [in Japanese] 117,118 Development of children's number concept and its training : I(3.Development (2),PROCEEDINGS OF THE FIFTH ANNUAL CONVENTION OF JAPANESE ASSOCIATION OF EDUCATIONAL PSYCHOLOGY PAPERS AND THE SUMMARIES OF DISCUSSIONS) [in Japanese]
