This is a set of the following four books. These items have been stored at home. "Suugaku Puzzle: How Many Questions Can You Solve?" Price: ¥680 "The World of Mathematics: General Knowledge Edition - Understanding the Basics of Mathematics! 25 Important Topics" Price: ¥680 "The World of Mathematics: Geometry Edition - Mathematics Becomes More Fun When You Understand Shapes!" Price: ¥680 "The World of Mathematics: The Mystery of Numbers Edition - You'll Understand Prime Numbers, Irrational Numbers, and Imaginary Numbers with This One Book" Price: ¥680