Objective: Classify shapes based on defining attributes using examples, variants, and non-examples.
In Lesson 1, students use straws cut at various lengths to create and then classify shapes. A list of the attributes that are common to a set of shapes is created. As students create a new shape with their straws, they decide if it has all the listed attributes. The names of these shapes are intentionally omitted during this lesson to encourage students to use precise language as they describe each shape. In this way, students attend to, and clarify, a shape’s defining attributes (1.G.1).
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