Yotsuya Otsuka Yosyu Series 4th Grade Math, Japanese, Science, and Social Studies - 12 Items These items are a mix of new, unused items and used items purchased here. The used items were purchased as "beautiful items with few writings," and I have not written in them. Please forgive any oversight. For those who understand that these items have been handled by a child and may have folds or scratches from storage. Not cut. All with answer keys. A very good value set. ① Math Exercise Book Part 1 with answer key - New, unused ② Math Exercise Book Part 2 with answer key - New, unused ③ Math Winter Course with answer key - New, unused ④ Social Studies Exercise Book Part 1 with answer key - Almost clean, but some writing ⑤ Social Studies Exercise Book Part 2 with answer key - Almost clean, but some writing ⑥ Social Studies Summer Course with answer key - Some writing ⑦ Science Exercise Book Part 1 with answer key - New, unused ⑧ Science Exercise Book Part 2 with answer key - New, unused ⑨ Science Summer Course with answer key - Some writing ⑩ Science and Social Studies Winter Course with answer key - New, unused ⑪ Japanese Yosyu Series Part 1 - Writing and signs of use ⑫ Japanese Yosyu Series Part 2 - Writing and signs of use