Which One Doesn't Belong? Playing With Shapes

Which One Doesn't Belong? Playing With Shapes

  • 1599

By Christopher Danielson

An innovative and intuitive approach to geometry

This is not your typical shapes book. This introduction to geometry and mathematical thinking will excite young readers and make math a part of their everyday lives. Celebrated math educator Christopher Danielson encourages inquiry and critical thinking and sparks memorable mathematical conversations by asking which shape in each group does not belong. There's no one right answer - the important thing is to have a reason why. Kids might describe the shapes as squished, smooshed, dented, or even goofy. But when they justify their thinking, they're talking math!

Winner of the Mathical Book Prize for books that inspire children to see math all around them.

Look Inside the Book:

Author & Illustrator Bios:

Christopher Danielson, author and illustrator

Christopher Danielson is a former middle-school teacher who has worked with math learners of all ages. Armed with a PhD in mathematics education, he creates books and toys to support children's mathematical development. He is the author of Common Core Math for Parents for Dummies and the developer of Math On-A-Stick, an annual family math event at the Minnesota State Fair. He lives in St. Paul, Minnesota. 

Awards & Honors:

Coming Soon!

Editorial Reviews:

Kirkus Reviews, starred review

A math concept book that encourages creative thinking and celebrates all answers, as none are wrong! A lengthy introduction of five and a half spreads introduces readers to the kind of mathematical thinking Danielson is encouraging. The first spread matches the final ones and presents four shapes, asking readers: "Which one doesn't belong? Why?" The next spreads explain how every answer is correct—one needs only to support it. Is it the triangle among the quadrilaterals? The one shape that is an outline instead of a solid color? Nine spreads then follow that each present kids with four new shapes and the same questions, bold colors attracting and holding interest as kids pore over the similarities and differences. The author's note emphasizes that "All properties count here; all ideas matter….You're thinking in a mathy way when you notice sameness and difference for one property at a time." And refreshingly, Danielson doesn't care about technical language—observations trump terms, so don't worry about describing them as "smooshed…dented…or colored in"; just describe them. This is one shape book that will both challenge readers' thinking and encourage them to think outside the box.


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ISBN: 978-1-58089-944-4

ISBN: 978-1-58089-946-8

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Ages: 4-8
Page count: 40

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