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Which One Doesn’t Belong!

Sarah VonEsh
1st grade
Chattahoochee Elementary School
Forsyth County Schools


In this task, students will become familiar with the different ways to classify shapes by attributes (size, shape, color, number of sides). Students will self-select multiple shapes and classify them by a common attribute, and determine “which one doesn’t belong”.

Illustrative Task
Adapted from Math Connections: Linking Manipulatives and Critical Thinking by David J. Glatzer and Joyce Glatzer (1997) by Dale Seymour Publications.
  • Use attribute blocks to combine and create different shapes.
  • With a partner, look at the samples provided and decide which one does not belong.
  • Discuss the reasons that you think a certain shape does not belong with the other three.
  • With your partner, create your own set of shapes with one that doesn’t belong.
  • Draw your puzzle problem to be included in a class book to share.

GPS Addressed
M1G2. Students will compare, contrast, and/or classify geometric shapes by the common attributes of position, shape, size, number of sides, and number of corners.

Video Information
Use these questions to guide your thinking about some of the important teacher ideas in the lesson featured in the video clip.
  1. What kinds of questions does the teacher ask to promote students’ problem solving?
  2. How is the teacher gauging students’ current understandings and building from those understandings?
  3. Consider the GPS standards listed with this video.
  4. What makes this lesson different from lessons you have taught on this topic?

Classroom Materials

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