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Area of Irregular Shapes – Area of Combined Rectangles – Digital Activities + Video Lesson


SKU: 5472174 Categories: ,


Your students will love the bright and engaging Google Slides Activities to practice finding the Area of Irregular Shapes. Students will learn how to calculate the area of irregular figures by decomposing them into rectangles. They will find the Area of Combined Rectangles in more than one way to truly understand the concept.

You will love the ready-made Video Lesson, which makes this resource perfect for math stations, review or tutoring. This resource can also be used to teach your whole class lesson, as you work with students and teach the concept using the interactive Google Slides. This Simple and Easy-to-Use lesson is designed for 3rd grade students and aligns to TEKS 3.6D and CCSS 3.MD.C.7d.

What Teachers are saying:

⭐⭐⭐⭐⭐This resource was so easy to implement. Thank you for making something that gave the instruction and lesson. I was able to send my upper students on to work on this on their own while the others still worked on area and perimeter. -Holly J.

⭐⭐⭐⭐⭐This aligned perfectly with the curriculum! It was easy to follow and engaging. -Danielle D.

The Video Lesson:

  • Teaches students how to decompose irregular (rectilinear) figures into rectangles
  • Show students how to find the area of each rectangle and add them together to find the area of the larger figure
  • Walks students through the Google Slides activities they will complete
  • Is approximately 8 minutes
  • Student Devices must have access to You-Tube to view the Video Lesson

⭐Many of the slides are self-checking, so students can work through the activity with confidence.

Activities Include:

  • Engaging practice with Movable Pieces
  • Matching Activities
  • Application of Learning in Real-World Word Problems
  • Word Problems have optional Step-by-Step support

What’s Included?

  • Video Lesson with Activity Instructions
  • 12 Interactive Activities
  • Teacher Key in separate Google Slides™ doc that can be assigned to students to check their work at home with their parents
  • PDF with a link to make a copy of the Google Slides™ in your Google Drive
  • Directions on how to assign the Google Slides™ activity to students in Google Classroom™

Standards Alignment

TEKS 3.6D Decompose composite figures formed by rectangles into non-overlapping rectangles to determine the area of the original figure using the additive property of area.

CCSS.3.MD.C.7d Recognize area as additive. Find areas of rectilinear figures by decomposing them into non-overlapping rectangles and adding the areas of the non-overlapping parts, applying this technique to solve real world problems.

This is Lesson 4 in a comprehensive bundle that covers all the area topics your students need to learn!

Save 30% on this resource by purchasing the Digital Area Bundle!

Lessons in the Digital Area Bundle Include:

Area Lesson 1: Understand the Concept of Area by filling Rectangles with Square Units

Area Lesson 2: Find Area by Multiplying the Number of Rows by the number of Unit Squares in Each Row

Area Lesson 3: Multiplying Whole Number Side Lengths to find Area

Area Lesson 4 *This Lesson*: Area of Irregular Shapes using Unit Squares

Area Lesson 5: Area of Irregular Shapes using Side Lengths

Area Lesson 6: Use Area Models to Prove the Distributive Property

You may also be interested in this coordinating Perimeter Bundle.

Additional information

Resource Type

Digital Resources

Grade Level


Number of Pages

12 practice slides + Video + Answer key

Common Core