Sir Cumference and the Dragon of Pi is the story of a boy that must use math to save his father. Most of the character's names are terms found in math, like Sir Cumference and Radius, which cleverly adds to the effect of the story. The use of a dragon gives the story more of a fantasy feel which appeals to the younger audience. The illustrations in the book are done well and add to the medieval setting of the book because they look like oil paintings. The goal of this book is to introduce kids to the concept of pi in a fun and easy to understand way. It pulls this off by having a fairy tale setting and actually having a reason to use pi that kids can understand. This book is not a quick read, yet it's not long enough to lose the attention of a child. Even though this is a children's book, it should only be used for older children since it involves division with fractions. Because of this, it works as a great educational tool for those older children by introducing them to a fundamental math term they will most likely use later in life.