"Z-Kai Thinking Skills Expanding Workbook for Elementary School Students, Standard Edition: Selection" Edited by Z-Kai Price: ¥1000 When answering, I wrote on a separate sheet of paper, but I accidentally wrote directly on the page for problem number 38, so I have erased it with an eraser. There are no other writings on the pages. There are folds and stains on the cover and inside pages, but I think it will not interfere with solving the problems. Please consider this item with the understanding that it is a used product. #Z-Kai Editorial Department #Book #Society/Education/Learning