Lesson 5

Sorting Shapes

Est. Class Sessions: 2–3
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Mathematical Standards

3.G.A
Reason with shapes and their attributes. (3.G.A.1)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in solving them.
MP3.
Construct viable arguments and critique the reasoning of others.
MP5.
Use appropriate tools strategically.
MP6.
Attend to precision.
MP7.
Look for and make sense of structure.

Students use the four-sided shapes they made from triangles in Lesson 4 to continue to analyze, describe, and classify two-dimensional shapes.

Content in this Lesson

  • Analyzing two-dimensional shapes using their properties [E1].
  • Identifying two-dimensional shapes using their properties [E3].
  • Drawing two-dimensional shapes using their properties [E3].
  • Classifying two-dimensional shapes using their properties [E4].
  • Justifying conclusions using geometric properties [E7].
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Guide
Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Students

bag or envelope to store Quadrilateral Sort Cards
self-adhesive notes
scissors

Materials for the Teacher

Display of Shapes from Triangles Masters (Teacher Guide). See Materials Preparation.
Display of Sorting Shapes pages (Student Guide) Pages 310–313
Display set of the Quadrilateral Sort Cards Master (Teacher Guide)
Six sets of the cards on the Quadrilateral Sort Cards Master (Teacher Guide)
Unit 11 Assessment Record
Display set of tangram pieces
Display of Shapes from Triangle chart. See Materials Preparation.
Display of Shape Finder chart. See Materials Preparation.
chart paper

Materials Preparation

Prepare Shapes from Triangles Chart. Cut apart the cards on the Shapes from Triangles Masters. Tape each card to the top of a larger piece of chart paper.

Prepare Shape Finder Chart. Prepare and display chart paper for the Shape Finder game. See Figure 1.

Figure 1
Figure 1: A prepared Shape Finder chart for Part 1

Prepare Quadrilateral Sort Cards. Ask students to cut apart the cards on the Quadrilateral Sort Cards page from the Student Activity Book and place them in a bag or envelope to use during the lesson and then at home to play a game.

Place Mystery Sort in a Learning Center. Prepare copies of the Mystery Sort: Quadrilaterals page from the Student Activity Book and the Quadrilateral Sort Cards Master to provide targeted practice with describing and classifying two-dimensional shapes using the properties of shapes.

Assessment in this Lesson

Assessment Expectation Assessed

Sorting Shapes
Check-In: Question 7
Student Guide
Page 313
E1.
Describe and analyze two-dimensional shapes using their properties (e.g., number of sides, length of sides, vertices, number and size of angles, number of right angles, and relationships between sides).
E3.
Identify and construct two- and three-dimensional shapes using their properties.
E4.
Classify 2- and 3-dimensional shapes using their properties.
E7.
Justify conclusions using geometric properties.

Observe
Mystery Sort: Quadrilaterals
Student Activity Book
Page 443
E1.
Describe and analyze two-dimensional shapes using their properties (e.g., number of sides, length of sides, vertices, number and size of angles, number of right angles, and relationships between sides).
E4.
Classify 2- and 3-dimensional shapes using their properties.