A great book to introduce the concept of angles to students with a catching story and delightful illustrations. ( )

Part of a series of fun, Medieval adventure stories that introduce mathematical concepts for young readers. This one introduces acute, obtuse, and right angles, as well as the concept of parallel lines. ( )

Sir Cumference is a series of entertaining, clever, and imaginative medieval fantasy tales set in a world full of fun geometry-based names and lands. The reader follows the adventure of each book and discovers new math concepts along with the knights and ladies in the stories - and sometimes dragons. I've always loved a good picture book, and I still do - and these books are a wonderful example of a quality picture book. I've enjoyed Sir Cumference immensely in both childhood and adulthood.

Each book is engaging and well-written, with endearing and clever characters, exciting adventures, and humor throughout. I laugh at the puns and plays on words and at the hilarious situations the characters often go through. I'm amazed at the loveliness of the illustrations, which - like the text - are colorful, funny, exciting, and imaginative, as well as beautifully painted on actual canvas, with gorgeous lighting and color.

And the math concepts presented in the text are humourously, clearly, and simply explained, while still retaining complex and sophisticated information of basic geometry and sometimes other areas of math. And in the context of a fun story, they're easy to remember and recall. A very young child can understand the explanation of the basic concept, the full explanation can aid the learning of an older student, and teens and adults can enjoy the clever books just as much.

I'm good at math, but it's never come easily to me, as it does for my siblings. I struggle to learn and understand math concepts when I can't understand the why and how behind them. Even as a teen and adult, and as a child, reading Sir Cumference helped give me that brilliant light-bulb moment of finally understanding why the equation to find the circumference or area of a circle is the way it is, and works the way it does. The books break these concepts down and show them in concrete, tangible ways, rather than only abstract, nebulous numbers and equations. This way, it's easy to understand how the equation works to produce the number, instead of being unreachable and impossible to wrap one's mind around. Weaving the math into the context of an imaginative story with relatable characters also helps so much, because that's how my mind and imagination engage best with information. If I get the chance to follow in my parents' steps and homeschool my own kids someday, or even if I don't, I will definitely be using these books to teach my future children, if I have any.

I first read the Sir Cumference series as an elementary school-aged child, and I've loved them ever since. The stories have always made me laugh and captured my imagination. It's been a few years since I've read them, and upon rereading the series, I'm pleased to find that the books are are just as wonderful and quality now that I'm an adult and a writer. I was also overjoyed to recently discover the existence of more Sir Cumference sequels that I'd wished for for many years.

I grew up with the first four SirSir Cumference books, and they're special to me, but I enjoyed a couple of the new ones just as much. The first four books in the series are best read in order, but some of the later books were not published chronologically, and they can be read in any order after the first book. For instance, The Isle of Immeter can be read in any order after the first two books, but it should be read before The Viking's Map, since it introduces a new female protagonist. My favorite books in the series are definitely the ones featuring Sir Cumference's son Radius as the main character - the ones I grew up on, and also the slightly newer books I read more recently that follow both Radius and his female cousin Per of Immeter.

The Sir Cumference books are full of sweet characters, exciting tales, adventure, entertaining humor, learning, and more. All this is contained in a short picture book - no small feat! I highly recommend the Sir Cumference series to people of all ages who enjoy a clever and fun story, especially to teachers and homeschoolers for teaching math in an entertaining and engaging manner.



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Sir Cumference and the Great Knight of Angleland follows Sir Cumference's son, Radius, as he sets off on a quest to earn his knighthood. I give this book a 5/5 because it is a thrilling, adventurous read that introduces some wonderful concepts about angles and how to measure them. This is a great book to read aloud in class before starting a unit on angles or angle measurement. The book even comes with a paper protractor matching the medallion that Radius uses in the story. ( )

In order to become a knight Radius was told by his father, Sir Cumference and his mother Lady Di of ameter he had to go on a quest to rescue King Lell. As Radius goes on his quest he learns much about the land he will once rule. This book is an excellent math book especially for introducing geometry right angles. This book covers the Math TEKS 4.6A and 4.6C. Throughout the book the different triangles are discussed, ending with parallels. Personally I plan to use these books to help my students who are struggling with understand and recognizing the different triangles. There is a complete series of these math books that are very helpful for students, This book would also be good for English specifically TEKs 4.6G and 4.10A which states students should evaluate details and determine key ideas along with exploring the authors purpose and intent within a text. Great book for introducing geometry in math and exploring authors in English. ( )