Thank you for viewing this product. This is a set of 4 books from Shogakukan's Doraemon Study Series. How about giving them as a present to your children or grandchildren? ▶Doraemon Study Series: Fun Math Strategies ❶ Addition and Subtraction With fun story developments unique to the Doraemon manga, you can correctly and easily understand "why it happens." You can learn regardless of grade level. ❷ How to Calculate Quickly This book explains the tips and how to solve common mistakes in addition, subtraction, multiplication, division, fractions, and decimals in an easy-to-understand manner. You can also learn the basics of the four arithmetic operations for junior high school entrance exams. ❸ Understanding Figures With fun story developments unique to the Doraemon manga, you can correctly and easily understand "why it happens." Perfect for advanced study and challenge learning. ❹ Applied Problems Solved with Diagrams and Pictures This book makes children who say, "Applied problems are difficult and I'm not good at math, I hate math" smile. It illustrates the problem statements with pictures, clearly shows the train of thought, and includes various methods to lead to the correct answer. I see, I understand! Let's study with Doraemon. #Kanjiro Kobayashi #Nichinoken #Fujiko F. Fujio Pro #Mathematics #Fujiko F. Fujio #Nichinoken Guidance #AST Reference Books ※ I also have other reference books and children's books for sale. ▩▩▩▩▩▩▩▩▩▩▩▩▩▩▩▩▩▩▩▩ ● Condition of the books ▪ Cover There are wrinkles and scratches on the front and back covers, corners, and edges (photos 1-9). The most noticeable are the staple marks on the cover and the body of ❸ (photo 9), and a fold inside ❶ (photo 10). Other than that, there is no noticeable damage, and although not in excellent condition, they are relatively clean. ▪ Body There are stains, fold marks, and slight dirt on the top and sides (photos 3-8, 12). The most noticeable is a red pen mark on P31 of ❷ (photo 11). Other than that, there is no noticeable damage, and although there is writing in ❷, it does not interfere with learning. However, since these are used items, those looking for perfect or like-new items may want to refrain from purchasing. ● Packaging and Shipping They will be placed in an OPP bag (rain protection), wrapped in cushioning material, and shipped via Mercari delivery. We are waiting for your purchase if you can understand and agree that these are used items and have been stored at home (immediate purchase is welcome). There are parts that are not shown in the photos, so please feel free to ask if you have any questions.