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Sir Cumference #2
[Sir Cumference and the Dragon of Pi] [By: Neuschwander, Cindy] [February, 1999]
For fans of the Sir Cumference series with Pi on their mind, here is the second installment in this fun look at math and language.This time the math adventure is centered around a potion that changes Sir Cumference into a fire-breathing dragon. Can Radius change him back? Join Radius on his quest through the castle to solve a riddle that will reveal the cure. It lies in discovering the magic number that is the same for all circles.Perfect for parent and teachers who are looking to make math fun and accessible for everyone.
Paperback
First published February 1, 1999
14 people are currently reading
946 people want to read
About the author
Cindy Neuschwander
39 books55 followersCindy Neuschwander is a native Californian, born in San Diego, CA. Her father was a naval officer and later a high school teacher and her mother was a homemaker. She has one younger brother.
Cindy graduated with a BA in International Studies from Willamette University and earned an MA from Stanford University. She has taught all grades in elementary school as well as high school.
Cindy began writing books in 1994. She had used math literature with her own classes in the early 1990’s and liked the way students responded to it. She wanted to use more of these books but found there were not many available so she started writing some of her own. Her books are published by Charlesbridge, Henry Holt, and Scholastic. She usually writes one book a year.
When she is not teaching or writing, Cindy enjoys spending time with her family. She has been married to her husband, Bruce, for over 30 years. Their older son, Tim, is a medical doctor working in orthopedic research. Their younger son, Seth, is a college student training to become a firefighter. Cindy and Bruce own three dogs; two Dalmatians and a Gordon Setter. Cindy loves to travel, bike ride, and swim. She and her family are Christians who are active in their local church.
Cindy graduated with a BA in International Studies from Willamette University and earned an MA from Stanford University. She has taught all grades in elementary school as well as high school.
Cindy began writing books in 1994. She had used math literature with her own classes in the early 1990’s and liked the way students responded to it. She wanted to use more of these books but found there were not many available so she started writing some of her own. Her books are published by Charlesbridge, Henry Holt, and Scholastic. She usually writes one book a year.
When she is not teaching or writing, Cindy enjoys spending time with her family. She has been married to her husband, Bruce, for over 30 years. Their older son, Tim, is a medical doctor working in orthopedic research. Their younger son, Seth, is a college student training to become a firefighter. Cindy and Bruce own three dogs; two Dalmatians and a Gordon Setter. Cindy loves to travel, bike ride, and swim. She and her family are Christians who are active in their local church.
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Displaying 1 - 30 of 177 reviews
March 18, 2025
My Son's 10th grade Geometry class was required to read this for Pi Day last Friday. After seeing the cover after so many years, I just had to take another dive right into this Classic all over again!
I forgot has PRECIOUS this book was with all of its amusing word play. Lol. And, How could I ever forget Radius' Mother's name, "Lady Di of Ameter?" 👸
Out of all the children genre books I have Loved, this author has created the Best character names to Elevate
this story. Such a Priceless Treasure. 🐉🥧🐉
I forgot has PRECIOUS this book was with all of its amusing word play. Lol. And, How could I ever forget Radius' Mother's name, "Lady Di of Ameter?" 👸
Out of all the children genre books I have Loved, this author has created the Best character names to Elevate
this story. Such a Priceless Treasure. 🐉🥧🐉
March 14, 2011
In my opinion, this entertaining book does a fairly good job of introducing the pi ratio to younger kids. However, my son's 2nd grade teacher read it to her class and they didn't quite get it. For example, one girl thought the ratio was 7 (instead of 3 1/7), because in the final example the diameter is 7. We then did a hands-on activity from the Exploratorium web site, which is a good way to reinforce the concept.
(I also wonder how many kids will walk away from this series thinking that "pi" has that name because of a pie-eating party, that "diameter" is after Lady Di of Ameter, etc. etc. I'm not saying that the books shouldn't be read, but I wonder if literal minded kids will understand which aspects are made up since the math is all real.)
But hey, if you want an excuse to have an annual Pie Eating Event on March 14th, get this book and read it to your children. :^)
(I also wonder how many kids will walk away from this series thinking that "pi" has that name because of a pie-eating party, that "diameter" is after Lady Di of Ameter, etc. etc. I'm not saying that the books shouldn't be read, but I wonder if literal minded kids will understand which aspects are made up since the math is all real.)
But hey, if you want an excuse to have an annual Pie Eating Event on March 14th, get this book and read it to your children. :^)
November 5, 2018
If your child is learning about the circumference, radius and pi in math, get this book out to make the experience more fun and memorable! The formula will definitely stick, especially if you do a little play-acting around home with a measuring tape. Who said learning had to be droll!
Ages: 8 - 12
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Ages: 8 - 12
**Like my reviews? I also have hundreds of detailed reports that I offer too. These reports give a complete break-down of everything in the book, so you'll know just how clean it is or isn't. I also have Clean Guides (downloadable PDFs) which enable you to clean up your book before reading it!
Visit my website!
April 14, 2012
This story is incredibly engaging and uses mathematical terms in a fun and clever way that would keep children engaged even if they weren't completely familiar with the math being used. It introduces the concept of pi in a fairy tale way, which allows for whimsical and interesting illustrations that math books so often lack. Even if the concept of pi is difficult for students to understand from this story, it still does a good job of introducing math vocabulary such as diameter, radius, circumference, geometry, symmetry, and more. It also is a good way to explain to students how math can be used outside of school (even though this is a fairy tale, Radius still had to use math to save his father!). Students will have fun with this adventurous math tale! I would recommend this book for 4th-5th grade students.
December 1, 2014
Charming and engaging. This book is a wonderful introduction to the concept of Pi. The text is witty, the illustrations are captivating and the concept is featured. My six year old did not understand Pi when we were done, but that wasn't the point. The point was to expose him to a way of seeing math in 3D. I consider this a Living Math Classic. It is a book that requires several readings and can be enjoyed again and again and again because it offers many layers to the reader. This is a staple in our homeschool bookshelf.
December 5, 2011
I liked this book a lot. Although the title is incredibly cheesy, the story is actually pretty good. The writing effectively explains pi and the math behind it. I think this book is a great way to introduce students to the concept of pi. It can teach how and why pi is used. I feel that ideally a teacher can then have an easier time expanding on the lesson because the students would already be familiar with both concept of pi and the vocabulary that surrounds it.
November 30, 2011
I actually understand Pi now better than I ever did. Where was this when I was in school, getting great grades in math without every truly understanding what I was doing...?
Update: My son has been learning about Pi and the formula for finding the circumference of a circle for a few weeks. He failed the whole unit, and I'm glad I remembered this book. We read it together, and he was motivated to experiment with string and measuring tape on various circular objects around the house. He has this formula truly understood now instead of memorized, and on several enrichment practice exercises he performed perfectly. He owes it all to this book.
Update: My son has been learning about Pi and the formula for finding the circumference of a circle for a few weeks. He failed the whole unit, and I'm glad I remembered this book. We read it together, and he was motivated to experiment with string and measuring tape on various circular objects around the house. He has this formula truly understood now instead of memorized, and on several enrichment practice exercises he performed perfectly. He owes it all to this book.
April 22, 2012
Entertaining story about a young boy who tries to cure his father from having been turned into a dragon! Within the story the concept of pi and other terms such radius and diameter are introduced as characters. The students will enjoy the story and at the same time learn about Pi! Activity: as the story is read the students can record the vocabulary words. After the lesson, the teacher distributes pies made out of construction paper, the students will measure the diameter and find the radius to calculate the circumference of the pie.
April 4, 2011
This entire series is complete genius! The name of the main character is Sir Cumference (circumference). Clever, huh? I loved this book and feel it would make a great math lesson to 4th-5th graders. They may not be able to actually solve the problems in the books, but it makes a great introduction to mathematical terminology. I believe it is extremely important that students find educational literature that is fun and Neuschwander does a great job doing that with this text!
May 5, 2019
This is a very nice way to introduce a complex concept to younger students. And everything is better with dragons!
October 30, 2022
As a Mathematics teacher I find Ms. Neuschwander's books entertaining and good teaching tools for introducing concepts to young learners.
November 25, 2024
Another fun title from Newschwander. This time we learn about circles.
January 25, 2020
Fun! I'm going to try to use this in my math classes.
August 9, 2008
I am such a math nerd--I love this book! I love the names of the characters (Sir Cumference and his son Radius, Geo Metry and his brother Sym, Lady Di of Ameter, etc.) and the way the author tells a fairy tale about a knight turning into a dragon when he drinks a potion, and really it's a funny way to explain the meaning of the mathematical value/symbol "π." ("pi"--in case my inserted symbol doesn't translate in cyberspace)
My only real quibble with this picture book, well, I have two: the reverse potion poem label doesn't rhyme & is a little hard to read out loud, and the illustrations look a little pixelated as though someone scanned images of paintings and then tried to blow them up a little too far. But otherwise, I think this book is great! Perfect for reading to elementary age kids, and I think it could even work (with the right group of kids) in a math class about to embark upon the new and strange world of irrational numbers. Woohoo! (Hey--I already admitted to being a math nerd.)
My only real quibble with this picture book, well, I have two: the reverse potion poem label doesn't rhyme & is a little hard to read out loud, and the illustrations look a little pixelated as though someone scanned images of paintings and then tried to blow them up a little too far. But otherwise, I think this book is great! Perfect for reading to elementary age kids, and I think it could even work (with the right group of kids) in a math class about to embark upon the new and strange world of irrational numbers. Woohoo! (Hey--I already admitted to being a math nerd.)
March 30, 2014
This book is definitely one of the more interesting ways I've seen on how to teach the value of Pi. For a book about mathematics, there is a surprisingly decent story that will keep you interested in what is happening to our characters while you are taught the value of Pi in the process. The art in the book is also very well done. It is very colorful and lively and the idea of using the art to represent the different, measuring diagrams to represent Pi is a very smart move on both the author and illustrator's part.
If I had to knock the book for anything, it would be that it does feel a little rushed sometimes and younger readers might skip or misunderstand one of the formulas or steps needed to find Pi.
If I had to knock the book for anything, it would be that it does feel a little rushed sometimes and younger readers might skip or misunderstand one of the formulas or steps needed to find Pi.
May 30, 2015
Fun way to learn math! My 9 year old loved finding out *WHY* there is such a thing as pi.
December 27, 2018
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.
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.
September 28, 2017
Author: Cindy Neuschwander
Illustrator: Wayne Geehan
First published: 1999
Length: 32 pages
"The Circle's Measure
Measure the middle and circle around,
Divide so a number can be found.
Every circle, great and small -
The number is the same for all."
Measurements in feet and inches.
Defines pi and demonstrates how it is consistent across all circles.
Sir Cumference:
Book 1 Sir Cumference and the First Round Table
Book 2 Sir Cumference and the Dragon of Pi
Book 3 Sir Cumference and the Great Knight of Angleland
Book 4 Sir Cumference and the Sword in the Cone
Book 5 Sir Cumference and the Isle of Immeter
Book 6 Sir Cumference and all the King's Tens
Book 7 Sir Cumference and the Viking's Map
Book 8 Sir Cumference and the Off-the-Charts Desserts
Book 9 Sir Cumference and the Roundabout Battle
(ISBN 9781570911644)
-CR-
Illustrator: Wayne Geehan
First published: 1999
Length: 32 pages
"The Circle's Measure
Measure the middle and circle around,
Divide so a number can be found.
Every circle, great and small -
The number is the same for all."
Measurements in feet and inches.
Defines pi and demonstrates how it is consistent across all circles.
Sir Cumference:
Book 1 Sir Cumference and the First Round Table
Book 2 Sir Cumference and the Dragon of Pi
Book 3 Sir Cumference and the Great Knight of Angleland
Book 4 Sir Cumference and the Sword in the Cone
Book 5 Sir Cumference and the Isle of Immeter
Book 6 Sir Cumference and all the King's Tens
Book 7 Sir Cumference and the Viking's Map
Book 8 Sir Cumference and the Off-the-Charts Desserts
Book 9 Sir Cumference and the Roundabout Battle
(ISBN 9781570911644)
-CR-
December 27, 2023
Sir Cumference suffers a stomach ache and asks his son Radius to find medicine from the doctor, who is, unfortunately, missing, leading to the transformation of the gentleman into a dragon.
Radius faces a challenge to solve the mystery poem from the container in the doctor’s workshop, revealing the correct dose for converting a dragon back to a human. As the label guides: “Measure the middle and circle around, Divide so a number can be found. Every circle, great and small – The number is the same for all.” Radius goes on an adventure to find the mystery number, finding a clue in the kitchen while his cousin makes a pie that the number is more than three but less than 4. He continues his exploration in the workshop, measuring and confirming the formula with examples.
“Sir Cumference and the Dragon of Pi” makes it easy for the reader to remember the formula for calculating π and visually enhance the theory with muted autumn colour illustrations. With all the good intentions, the target audience – secondary school children might not appreciate it entirely as the thought will be that picture books serve youngsters. The book is better suited for US readers than UK and European students, as measurements are recorded in inches. However, the story offers practical benefits for exploration at home and taking the topic to a creative level in the classroom, linking it to inventions in a particular period of history.
Radius faces a challenge to solve the mystery poem from the container in the doctor’s workshop, revealing the correct dose for converting a dragon back to a human. As the label guides: “Measure the middle and circle around, Divide so a number can be found. Every circle, great and small – The number is the same for all.” Radius goes on an adventure to find the mystery number, finding a clue in the kitchen while his cousin makes a pie that the number is more than three but less than 4. He continues his exploration in the workshop, measuring and confirming the formula with examples.
“Sir Cumference and the Dragon of Pi” makes it easy for the reader to remember the formula for calculating π and visually enhance the theory with muted autumn colour illustrations. With all the good intentions, the target audience – secondary school children might not appreciate it entirely as the thought will be that picture books serve youngsters. The book is better suited for US readers than UK and European students, as measurements are recorded in inches. However, the story offers practical benefits for exploration at home and taking the topic to a creative level in the classroom, linking it to inventions in a particular period of history.
March 5, 2023
I'm desperately seeking mathy books. I am having very strong Math Thoughts these days. Math Parenting. Math Culture. MATH THOUGHTS.
I read through this to see if it would be appropriate for a pre-literate, semi-numerate preschooler. I think I saw somewhere it was more for elementary kids. Anyway, no. I think it's fine for a preschooler. The basic teaching here is PI. Pi is a thing. It's a magical number. Sort of. It's the measure of the circumference of a circle - any circle - if you multiply it by that circle's diameter. OK, now I'm never going to forget that formula.
I was amused by the names - which, obv, my kid will not at all notice as amusing. But PLEASE, you must call me Lady Di of Ameter from now on. It's a bit wordy in the middle. It feels a bit jumbled. The riddle is as opaque as the Sphinx. But the page with the various pies, wagon wheels, and other circles was clear enough.
Overall: I'm impressed. This one's a keeper. Now to see if my kid likes it.
I read through this to see if it would be appropriate for a pre-literate, semi-numerate preschooler. I think I saw somewhere it was more for elementary kids. Anyway, no. I think it's fine for a preschooler. The basic teaching here is PI. Pi is a thing. It's a magical number. Sort of. It's the measure of the circumference of a circle - any circle - if you multiply it by that circle's diameter. OK, now I'm never going to forget that formula.
I was amused by the names - which, obv, my kid will not at all notice as amusing. But PLEASE, you must call me Lady Di of Ameter from now on. It's a bit wordy in the middle. It feels a bit jumbled. The riddle is as opaque as the Sphinx. But the page with the various pies, wagon wheels, and other circles was clear enough.
Overall: I'm impressed. This one's a keeper. Now to see if my kid likes it.
August 14, 2025
When Sir Cumference gets turned into a dragon by a magic potion, his son Radius must untangle a riddle about measuring the outside of a circle compared to the distance across to find the right dosage of the antidote. The clock is ticking as the other knights don’t realize the dragon is Sir Cumference, and they are about to dispatch the beast.
Radius has to figure out the ratio between a circle’s diameter and circumference to save his father. He talks about it being 3 1/7 which feels like an odd way to talk about pi but the back of the book does explain how we usually write it. If this helps kids remember the relationship between a circle’s diameter and pi, great. It’s definitely more engaging than the average math textbook.
Radius has to figure out the ratio between a circle’s diameter and circumference to save his father. He talks about it being 3 1/7 which feels like an odd way to talk about pi but the back of the book does explain how we usually write it. If this helps kids remember the relationship between a circle’s diameter and pi, great. It’s definitely more engaging than the average math textbook.
March 8, 2024
I'm reading this aloud to 4th-6th graders for a lesson on Pi and Pi Day next week. The first time I read it, I thought it was too confusing for a read aloud. But I think it was just really late at night and I was super tired, ha. The kids seem to enjoy it as long as I know it well enough to emphasize the right parts or pause and ask a question. 6th graders definitely understand it more quickly than 4th graders, but all seem to enjoy it. the story is cute and filled with math puns, and a clear path of discovering and explaining what Pi is.
I paired it with a short TedEd video (4 minutes) on Pi and a challenge to make a paper chain for the first 1,000 digits of Pi. It's been fun!
I paired it with a short TedEd video (4 minutes) on Pi and a challenge to make a paper chain for the first 1,000 digits of Pi. It's been fun!
April 29, 2024
I read this story from an educational point of view to see if it was a good fit for my 7th grade math class. It was very easy follow and made a great introduction for the circle relationships concept. It is a story about a knight name Sir Cumference who is turned into a dragon and his son, radius, who goes on a quest to change him back. It is short enough that students could read it in one class period and really does explain that Pi is the relationship between the distance across the circle (diameter) and the distance around the circle (Circumference). A great way to engage students and incorporate literacy into a math lesson!
June 3, 2021
2.5/5 stars
This is a series of different books that tie into math concepts. The characters are named after different math concepts which is a great way to introduce new vocabulary. It is a wonderful example of how to integrate ELA and math.
These stories could be a great introduction to a math lesson. They could be used to introduce a concept or review something that has been being studied.
This book addresses Pi. I think it might be one of my least favorite in the series.
Grades: any covering the skills addressed!
This is a series of different books that tie into math concepts. The characters are named after different math concepts which is a great way to introduce new vocabulary. It is a wonderful example of how to integrate ELA and math.
These stories could be a great introduction to a math lesson. They could be used to introduce a concept or review something that has been being studied.
This book addresses Pi. I think it might be one of my least favorite in the series.
Grades: any covering the skills addressed!
July 26, 2021
This book has 32 pages and no table of contents. The characters in the story are Radius, Sir Cumference, Lady Di of Ameter, Lady Fingers, Geo of Metry, Sym of Metry, and the knights. The story took place outdoors and inside of a castle. The problem in the story is that Sir Cumference turned into a dragon after drinking a fire belly potion. The solution is that Radius found a potion to change his father, Sir Cumference back into a human. Radius had to solve for pi to make sure the potion measurements were correct so that his father did not stay a dragon forever.
September 5, 2024
How delightful to encounter a new book in the mega-clever Sir Cumference series.
You know, Goodreaders, these are math-minded books. And the name of this hero just might have something to do with the circumference of circles.
Another important character here is named Radius. Go figure!
SUCH A PROBLEM TO SOLVE
In this story, a magic potion turns Sir Cumference into a fire-breathing dragon. Can Radius change him back?
Readers follow Radius on his quest, seeking to solve a riddle that will reveal the cure. Gee, might that riddle involve the number PI?
FIVE STARS!
You know, Goodreaders, these are math-minded books. And the name of this hero just might have something to do with the circumference of circles.
Another important character here is named Radius. Go figure!
SUCH A PROBLEM TO SOLVE
In this story, a magic potion turns Sir Cumference into a fire-breathing dragon. Can Radius change him back?
Readers follow Radius on his quest, seeking to solve a riddle that will reveal the cure. Gee, might that riddle involve the number PI?
FIVE STARS!
April 21, 2018
I absolutely loved this book! As a future math, as well as elementrary, teacher, I would definitley use this book to introduce circles. There are so many terms included in this book indirectly (Sir Cumference, Lady Di of Ameter, Radius, etc) that will help children with those definitions later on in their math career without boring them. I was really surprised at how educational this book is; I had never seen a book include math, let alone geometry. I will definitely use this book to help my future students understand geometry.
March 1, 2019
10/10 Would recommend.
TW: some terrible math puns; my friend "they are agony"
My math teacher read this to us in class in honor of pi day. The story was captivating and entertaining. If you need to know how to find the circumference of a circle, this book will teach it to you in a very entertaining way.
I recommend this book to all math teachers for any day they just need something to entertain their class.
TW: some terrible math puns; my friend "they are agony"
My math teacher read this to us in class in honor of pi day. The story was captivating and entertaining. If you need to know how to find the circumference of a circle, this book will teach it to you in a very entertaining way.
I recommend this book to all math teachers for any day they just need something to entertain their class.
October 11, 2020
Sir Cumference and the Dragon of pi, is a fantastic book. This book allows teachers to introduce pi in a fun way to students. The book is written in the fantasy genre, but it also allows for the readers to learn mathematics in a fun and interactive way. This book can be used with both the little ones and students of higher grade levels. Even if the young students still don’t have a proper understanding of how Pi works, this story will definitely make learning Pi memorable.
November 14, 2021
This is a good little math book attempting to explain pi to children (book is on a third grade level) through narrative. While the book is cute, it is certainly not sufficient in and of itself for students to master diameter, circumference, and pi. While the little boy’s name is Radius, radius is not defined as being half of diameter. This book is a good start, but practice is necessary for students.
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