Which One Doesn't Belong?

Session Description

Which One Doesn’t Belong is an instructional routine designed to support all students in doing mathematics, particularly the art of argumentation and justification. In this routine, students are presented with four figures, numbers, diagrams, graphs or expressions and must decide which does not belong with the rest. This requires them to define the set – creating one category in which three of the items fit, and one does not – and describe relationships among the items. Engaging students in Which One Doesn’t Belong, creates space for students at different levels of understanding to make meaningful contributions in a low stakes environment.

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