Which One Doesn’t Belong with Shapes

The goal of this game is for children to describe different ways that shapes are alike and different. There is always more than one answer. If you like this game, check out the Which One Doesn’t Belong books by Christopher Danielson at https://talkingmathwithkids.com/ and Which One Doesn’t Belong books and videos from Sesame Street.

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What's the math in this game?

When children play this game, they are practicing an important mathematical habit of mind — giving precise descriptions of what they see, using evidence. There are lots of ways to describe shape attributes, or characteristics. You can focus on a shape’s straight or curved sides; number of sides; length of sides; number of corners or vertices; size of angles; and more.
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Which One Doesn’t Belong w/ Shapes(English)
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Which One Doesn’t Belong w/ Shapes(Spanish)
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Which One Doesn’t Belong?(Portuguese)