Primary Standards:

MAFS.5.G.2.3: Understand that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category.  For example, all rectangles have four right angles and squares are rectangles, so all squares have four right angles.

MAFS.5.G.2.4: Classify and organize two-dimensional figures into Venn diagrams based on the attributes of that figure.

Content Knowledge:

Since Kindergarten, students have developed a deep understanding of geometric shapes based on the attributes of the shapes.  In this unit, students will deepen and refine their understanding of shapes through hands on activities and math discussions.   These experiences will provide students with opportunities for them to visualize, sort, compare, discuss, and reflect about shapes.

Students will reason as they think about shapes on categories.  They talk about the shared characteristics that classify shapes into certain categories and begin to notice the hierarchy of shapes.  Students will extend their vocabulary of geometric terms, refine their understanding of the characteristics of shapes, and expand their geometric thinking. There is a tremendous amount of vocabulary in this unit related to geometric shapes and the characteristics of those shapes.  It is very important for students to understand and correctly use the geometric terms as they begin to sort, analyze, describe, compare and classify shapes.

GCG 1 – Learning Goal:  As a mathematician,I will be able to name shapes that belong in different categories based on attributes

• Step 1: Classify/name a polygon according to attributes
• Step 2: Read and/or create a hierarchy for polygons based on attributes
• Step 3: Connect understanding of polygon attributes to recognize that a polygon in a subcategory contains the attributes of all categories above it

GCG 2 – Learning Goal: As a mathematician,I will be able to organize shapes with Venn diagrams

• Step 1: Sort shapes using a Venn diagram, using selected or given attributes
• Step 2: Analyze a Venn diagram including a common attribute, determine missing attributes for a Venn diagram