# 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

### Lesson Timeline

 Warm-up 10 min Activity 1 15 min Activity 2 10 min Activity 3 20 min Lesson Synthesis 5 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?