Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Ikeda Hironori and Kitajima Mitsuhiro,Mathematics lessons based on a learning process that takes the Double Diamond Model into account : Through the practice of “Triangles and Quadrilaterals” in the Second Grade of Elementary School,佐賀大学教育実践研究,2189-065X,佐賀大学教育学部,2025-02-28,43,,159-165,https://cir.nii.ac.jp/crid/1390584940356849792,https://doi.org/10.34551/0002000789