Foreword Preface Section I TheWonders of Numbers and Shapes Around Us Chapter 1 Is “Paper” the Ultimate Strategy in a Rock-Paper-
Scissors Tournament!? Chapter 2 Math Magic with Tricks and Twists Chapter 3 The Numbers Around Us: Which Digit is Used the Most? Chapter 4 Conic Sections Created by Light Chapter 5 What Is the True Shape of a Crescent Moon Chapter 6 An Equation That Draws the Shape of a Pon de Ring Donut Chapter 7 The Method is Wrong, but the Result is Correct Chapter 8 A Mathematical Mystery! The Collatz Conjecture Chapter 9 Strange Magic Square Chapter 10 Rings That Look Different but Have the Same Volume Chapter 11 Convex Polygons and Radar Charts Chapter 12 What If We Used Dice to Decide How Much New
Year’s Money to Give? Chapter 13 Shapes Made with Triangles Chapter 14 Success Rate of the “Kendama” Challenge Chapter 15 Estimating the Dimensions of a 1-Liter Milk Carton Chapter 16 Seats on the Shinkansen (Japan’s bullet train) Divided into Two and Three Rows Section II Playful Math You Can Touch and Feel Chapter 17 Enjoying the Cleanup of Building Blocks Chapter 18 The Mysterious Surface Made of Cotton Swabs: A Hyperboloid Chapter 19 With 30 Toy Train Tracks, You Can Play for Over 200 Years Chapter 20 Is It Easy or Difficult to Make a Plarail Layout That Loops Back to the Start? Chapter 21 Looking at Pi Chapter 22 The Tower of Hanoi Algorithm Chapter 23 Folding Paper Along Curves Is Fun Chapter 24 Folding Paper to Reach the Moon Chapter 25 The Wonder of Repeated Folding Chapter 26 Modular Origami Balls and Polyhedral Duals Chapter 27 Pop-Up Figures Chapter 28 The Shape of a Peel Spun from an Apple Chapter 29 Fractal Figures Drawn by Coloring Grid Cells Chapter 30 A Rather Casually Made Star Polyhedron Chapter 31 The Wonder of Origami Crease Patterns Chapter 32 How Can We Fit As Much As Possible into an Envelope? Chapter 33 Spiral Made from Paper Tape Afterword