Lesson objective: Understand that we name and describe three-dimensional shapes based on their specific attributes.

Students bring prior knowledge of analyzing three-dimensional shapes from K.G.B.4. This prior knowledge is extended to building and modeling three-dimensional shapes as students construct three-dimensional shapes based on specific features. A conceptual challenge students may encounter is properly building the shapes using given attributes.

The concept is developed through work with models of toothpicks and clay, which helps students understand the different attributes of three-dimensional shapes.

This work helps students deepen their understanding of numbers because we use the number of faces, edges, and vertices to help name and describe a three-dimensional shape.

Students engage in Mathematical Practice 4 (Model with Mathematics) as they build three-dimensional shapes out of toothpicks and clay.

**Key vocabulary:**

- Cone
- Cube
- Cylinder
- Edge
- Face
- Rectangular Prism
- Square Pyramid
- Triangular Prism
- Triangular Pyramid
- Vertex/Vertices

**Special materials needed:**

- Multiple three-dimensional shapes
- Clay
- Straws
- Toothpicks