@article{oai:u-ryukyu.repo.nii.ac.jp:02004864, author = {Kotagiri, Tadato and 小田切, 忠人}, issue = {30}, journal = {琉球大学教育学部紀要 第二部}, month = {Mar}, note = {紀要論文}, pages = {7--12}, title = {The System of Teaching Calculation Focusing on the Division of Fractions -According to the "Suido Method"-}, year = {1987} }