In this unit, students will discover the defining and nondefining attributes of shapes. Students will also discover the ways to draw and build shapes by using those attributes. This extends upon student knowledge of distinguishing attributes of shapes. Students are likely to struggle with distinguishing between defining and nondefining attributes of shapes.
Key Concepts:
 Shapes have attributes that are both defining (number of sides) and nondefining (size).
 We can use two and threedimensional shapes to compose a composite shape.
Prior Knowledge Needed:
 Know how to compare and analyze 2 and 3dimensional shapes in different sizes and orientations; Defining attributes of circles and squares; (Grade K, Unit 11; K.G.B.4)
 Describe similarities, differences, and parts of shapes (e.g.; number of sides and vertices) and other attributes (e.g., having sides of equal length); (Grade K, Unit 3; K.G.A.1)
 Modeling and composing shapes; (Grade K, Unit 15; K.G.B.5)
Units on the Horizon:
 Recognize and draw shapes having specified attributes (e.g., the number of faces, sides, or angles) (Grade 2, Unit 10)
 Identify triangles, quadrilaterals, pentagons, hexagons, and cubes (Grade 2, Unit 10)
Lessons

Lesson objective: Understand that all shapes have defining attributes that cannot change because they name the shape, as well as nondefining attributes that can change without changing the shape. Students bring prior knowledge of comparing and analyzin...

Lesson objective: Sort shapes by defining and nondefining attributes. This lesson helps to build fluency with sorting shapes. Basic shapes are used here to highlight the similarities and differences between different shapes and their defining, and non...

Lesson objective: Understand that composite shapes are shapes created by putting other shapes together. Students bring prior knowledge of composing simple shapes to form larger shapes from K.G.B.6. This prior knowledge is extended to use more than 2 sha...

Lesson objective: Build composite shapes by putting other shapes together. This lesson helps to build fluency with composite shapes. Basic shapes (in the form of pattern blocks or shape cutouts) are used here to support student reasoning of how composi...

Lesson objective: Apply knowledge of shape attributes and composite shapes to solve a realworld problem. This lesson provides an opportunity for students to apply their knowledge and understanding of defining and nondefining shape attributes and compo...