← Grade 3 Math
Math · Grade 3 Math · Unit 7

Unit 7: Two-Dimensional Shapes and Perimeter

Students reason about shapes and their attributes, with a focus on quadrilaterals. They solve problems involving the perimeter and area of shapes.

Worksheets

Every sheet has an answer key. Free to print, no login.

Unit
📝 Worksheet ✅ Answer guide
Concept
Set 1
📝 Worksheet ✅ Answer key
Set 2
📝 Worksheet ✅ Answer key
Practice
Set 1
📝 Worksheet ✅ Answer key
Set 2
📝 Worksheet ✅ Answer key
Set 3
📝 Worksheet ✅ Answer key
Set 4
📝 Worksheet ✅ Answer key
Advanced
Set 1
📝 Worksheet ✅ Answer key
Set 2
📝 Worksheet ✅ Answer key
Set 3
📝 Worksheet ✅ Answer key
Set 4
📝 Worksheet ✅ Answer key

What this unit covers

A Reason with Shapes · 5 lessons
Goals
  • Reason about shapes and their attributes.
Lessons
  1. What Attributes Do You See?
  2. Attributes of Triangles and Quadrilaterals
  3. Attributes that Define Shapes
  4. Attributes of Rectangles, Rhombuses, and Squares
  5. Attributes of Other Quadrilaterals
B What Is Perimeter? · 4 lessons
Goals
  • Find the perimeter of two-dimensional shapes, including when all or some side lengths are given.
Lessons
  1. Distance around Shapes
  2. Same Perimeter, Different Shapes
  3. Find the Perimeter
  4. Perimeter Problems
C Expanding on Perimeter · 3 lessons
Goals
  • Solve problems involving perimeter and area, in and out of context.
Lessons
  1. Problem Solving with Perimeter and Area
  2. Rectangles with the Same Perimeter
  3. Rectangles with the Same Area
D Design with Perimeter and Area · 3 lessons
Goals
  • Apply geometric understanding to solve problems.
Lessons
  1. Shapes and Play
  2. Wax Prints
  3. A Space for Chickens (Optional)

Helpful to know first

The curriculum says this unit builds on these.

Grade 3 Math · Unit 2 Area and Multiplication
Open unit →
← Unit 6 See the whole map Unit 8 →

Adapted from the Illustrative Mathematics curriculum (v.360), licensed CC BY-NC 4.0. © Illustrative Mathematics.