Description 1. Deciding the Princess's Punishment — 11 ① Understand the surface area of three-dimensional shapes and learn what they look like when unfolded into a flat plane. ② Learn how to find the surface area of a rectangular prism. 2. The Bucket Brigade Operation Begins — 41 ① Understand the meaning of volume and capacity, and learn the relationship between volume, capacity, and weight. ② Learn how to find the volume of an object using the height of water in a water tank. 3. Infiltrating Kala Kuntai — 71 ① Learn the meaning of time of day and duration, and understand how they are used in everyday life. ② Understand the principles of sundials and learn about the various sundials used throughout history. ③ Understand how everyday clocks work and learn to read the given time. 4. A Desperate Battle with the Gwangpo Fish — 101 ① Learn about the various types of clocks that have been used throughout history. ② Learn how units of time used in everyday life were created. 5. The Great Battle Begins — 131 ① Understand the meaning of circumference and pi, and learn how to calculate them. ② Understand how to find the area of a circle and learn the formula for calculating it. 6. The Age of Trade Opens — 161 ① Understand the surface area of a cylinder and learn how to calculate it. ② Learn how to find the volume of a cylinder.