Unit Plan 27 (Grade 2 Math): Geometry Studio—Design with Attributes & Shares

Focus: Students design flags and floor plans that meet shape attributes and equal-share constraints; they present and justify choices using drawings, labels, and math talk.

Grade Level: 2

Subject Area: Mathematics (Geometry—Attributes, Arrays, Equal Shares)

Total Unit Duration: 5 sessions (one week), 45–60 minutes per session

I. Introduction

This week turns the room into a geometry studio. Learners identify and draw shapes with specified attributes, build rows and columns of same-size squares inside rectangles, and partition shapes into equal shares (halves, thirds, fourths). They use these skills to design flags/floor plans that satisfy given constraints and then explain why their designs work.

Essential Questions

• How can I use shape attributes (sides, vertices, angles) to meet a design rule?
• What does it mean for parts to be equal shares, and how can I show that clearly?
• How do rows and columns help me organize space inside a rectangle?

II. Objectives and Standards

Learning Objectives — Students will be able to:

1. Recognize, name, and draw shapes that match specified attributes (number of sides/angles; identify triangles, quadrilaterals, pentagons, hexagons, and cubes).
2. Partition rectangles into rows and columns of same-size squares and count them to find totals.
3. Partition circles/rectangles into equal shares (halves, thirds, fourths) and describe shares and the whole.
4. Create a design that satisfies attribute and sharing constraints, and justify choices with math language and labeled drawings.

Standards Alignment — CCSS Grade 2 (focus this week)

• 2.G.1: Recognize and draw shapes having specified attributes; identify triangles, quadrilaterals, pentagons, hexagons, and cubes.
• 2.G.2: Partition a rectangle into rows and columns of same-size squares and count to find the total.
• 2.G.3: Partition circles and rectangles into two, three, or four equal shares; describe the whole as shares; recognize equal shares need not be the same shape.
• Mathematical Practices: MP.3 (construct arguments & critique), MP.4 (model with mathematics) threaded; MP.5, MP.6 supported.

Success Criteria — Student Language

• I can draw and label shapes that match the attributes in the directions.
• I can show equal shares and explain how I know they are equal.
• I can use rows and columns to organize a rectangle and tell how many squares there are in all.
• I can explain why my design meets every rule.