Lesson 7

Flat and Solid Shapes

Lesson Purpose

The purpose of this lesson is for students to identify shapes as flat (two-dimensional) or solid (three-dimensional) as they build and sort shapes.

Lesson Narrative

In previous lessons, students explored, identified, created, and counted two-dimensional shapes such as circles and squares. In this lesson, students are not expected to use precise vocabulary so they may use words like “lying flat” to describe a two-dimensional shape and words like “solid,” “taking up space,” “tall,” or “sticks up” to describe a three-dimensional shape. Throughout this unit, students will hear and use “flat” and “solid” to describe two-dimensional and three-dimensional shapes. The names of common three-dimensional shapes will be introduced in a future lesson.
  • Action and Expression
  • MLR8

Learning Goals

Teacher Facing

  • Distinguish between flat and solid shapes.

Student Facing

  • Let’s build shapes with clay.

Required Materials

Materials to Gather

Materials to Copy

  • Flat Shapes Cards K

Required Preparation

Activity 1:

  • Each student needs a piece of clay.
  • Gather a cone and cylinder to display.

Activity 2:

  • Each group of 2 needs a set of solid shapes and a set of cards.

Activity 3:

  • Gather materials from: 
    • Counting Collections, Stage 1
    • Match Mine, Stage 1
    • Shake and Spill, Stages 1-4

CCSS Standards

Lesson Timeline

Warm-up 10 min
Activity 1 15 min
Activity 2 10 min
Activity 3 20 min
Lesson Synthesis 10 min
Cool-down 0 min

Teacher Reflection Questions

The standards ask students to “identify shapes as two-dimensional (lying in a plane, ‘flat’) or three-dimensional (‘solid’).” How does building shapes out of clay help students distinguish between two-dimensional and three-dimensional shapes?

Print Formatted Materials

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Additional Resources

Google Slides

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PowerPoint Slides

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