Your device is currently offline. You can view downloaded files in My Downloads.

Lesson Plan

4. Defining and non-defining attributes (FP)

teaches Common Core State Standards 1.G.2
teaches Common Core State Standards CCSS.Math.Content.1.G.A.1
teaches Common Core State Standards CCSS.Math.Practice.MP7
teaches Common Core State Standards CCSS.Math.Practice.MP3
teaches Common Core State Standards MAFS.1.G.1.1
Quick assign

You have saved this lesson!

Here's where you can access your saved items.


Card of

or to view additional materials

You'll gain access to interventions, extensions, task implementation guides, and more for this lesson.

Lesson objective: Reason to differentiate between geometrically defining attributes and non-defining attributes.

This lesson helps to extend understanding of attributes. Students will discuss non-defining attributes such as color, shape, and size of an object. Students will consider the "must haves" or defining attributes of a shape. Students will describe in their own words why a shape belongs to a given category. Two different attributes are used here because they encourage students to engage in problem solving that is about thinking and reasoning. This work develops students' understanding that shapes both defining and non-defining attributes.

Students engage in Mathematical Practice 3 as they construct viable arguments and critique the reasoning of others. Students will use clear definitions with peers as they define attributes and provide a viable argument reasoning why a shape lacks specific attributes. Students also engage in Mathematical Practice 7 as they look for and make use of structure. Students will use the patterns seen in different shapes to make comparisons. Students will use the relationships demonstrated in the defining attributes to explain similarities and differences.

Key vocabulary:

  • attribute
  • defining 
  • non-defining

Special materials needed:

  • envelopes, string
Related content

Appears in

Distinguishing attributes of shapes

Provide feedback