"kyōkasho." . . "教科書" . . . . "Minna to manabu shōgakkō sansū 2nen. ge"@ja . . . "みんなと学ぶ小学校算数2年. 下" . "Minna to manabu shōgakkō sansū 2nen"@ja . . . . . "Minna to manabu shōgakkō sansū ninen. 003"@ja . "Minna to manabu shōgakkō sansū ninen. 003" . . . . . . "sansūka." . . "算数科" .