Created by Mr. Jin Asakura, who mentored a gold medalist in the Arithmetic Olympics. I purchased this as an introduction to junior high school entrance exams for my child. This is a set of two books. 【Units】 is a rare educational material that is currently not available on Amazon or Rakuten Books. Converting units is a difficult topic. You can study units from all 6 years of elementary school. Unopened and unused. The film cover is still attached. Although it's shifted in the photo, the unit conversion ruler is also included. Please understand that this item has been stored at home for a long time. Depending on the packaging method, it will be shipped via either Yu-Yu Mercari Bin or Raku-Raku Mercari Bin. #arithmetic #elementary school arithmetic #arithmetic #arithmetic textbook #units #unit #yen #yen #junior high school entrance exam #junior high school entrance exam #Jin Asakura