Which One Doesn't Belong?

A Shapes Book

By: Christopher Danielson

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Hardcover | 2 September 2016

At a Glance

Hardcover
36 Pages

Age
8 - 12

Grade
3 - 7

Dimensions(cm)
20.3 x 20.3 x 1.27

Hardcover

$41.99

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Which One Doesn’t Belong? has won the Mathical Book Prize, which will be presented to Christopher Danielson at the National Math Festival in Washington, DC on April 22, 2017. The Mathical Book Prize is an annual award for fiction and nonfiction books that inspire children of all ages to see math in the world around them.

Every colorful page of Christopher Danielson’s children’s picture book, Which One Doesn’t Belong?, contains a thoughtfully designed set of four shapes. Each of the shapes can be a correct answer to the question “Which one doesn’t belong?” Because all their answers are right answers, students naturally shift their focus to justifications and arguments based on the shapes’ geometric properties.

In the companion teacher’s guide,(978-1-62531-081-1) Danielson shows how to facilitate rich discussions and teach mathematical argumentation using Which One Doesn’t Belong? He models how to listen closely and respectfully to students’ ideas about shapes. Danielson synthesizes research about how children learn geometry, discusses the role of geometry in the mathematics curriculum, and gives plenty of practical advice about different ways to implement Which One Doesn’t Belong? in classrooms. He also discusses the mathematical ideas likely to emerge on each page and—drawing from his direct experience using Which One Doesn’t Belong? at several different grade levels—helps teachers anticipate and think about students’ likely answers.

Most curricula treat geometry as little more than vocabulary lessons. Which One Doesn’t Belong? and its accompanying guide are powerful, flexible resources teachers can use to provoke lively discussions and deep learning about shapes with students of all ages.

Industry Reviews

"Danielson's book reveals the wonder and freedom of expression that many children don't often experience in mathematics. A single, simple question puts children in a position to speak mathematically, even at early ages. Ask students of all ages, 'Which one doesn't belong?' and revel in the reasoning and conversation that results."

- Dan Meyer

"Which One Doesn't Belong? is a brilliant new math book...If you are interested in inquiry-based thinking and routines that empower kids AND if you want to learn more about quality talk in the math classroom, you need this book immediately!'

- A Year of Reading, Franki Sibberson

"From kindergarten through calculus, students and their teachers gather around Which One Doesn't Belong? to have rich, open-ended discussions about geometry."

-The Mathical Prize

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