Triangle Sum Theorem Digital Pixel Art | Angle Sum | Halloween Math

Overview

Engage your 8th graders with this Triangle Sum Theorem digital pixel art activity using Google Sheets! Students practice finding missing angles and solving for x with 24 self-checking questions that reveal fun fall and Halloween images as they go. Perfect for reinforcing CCSS 8.G.A.5, this interactive resource gives instant feedback and includes printable workspace and answer keys. It’s a perfect no-prep tool for homework, review, or math centers that keeps kids motivated while mastering triangle angle sums.

Why you'll love this

These self-checking Google Sheets give students instant feedback. Incorrect answers are highlighted in red, and correct answers turn green and unlock parts of a mystery picture. They’re easy to assign, keep students engaged, and free up your time for differentiation.

CCSS Standards: 8.G.A.5

Great to pair with parallel lines cut by a transversal pixel art activity! This activity is differentiated, one level contains easier problems where students solve for the missing angle in the triangle, while the second level contains more complex problems where students have to set up equations with variables to find x.

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What's included:

  1. Instructions. Know how to assign both with and without Google Classroom.
  2. Pixel Art Google Sheet #1. Triangle Sum Theorem (Find the missing angle)
  3. Pixel Art Google Sheet #2. Triangle Sum Theorem (Solve for x)
  4. Work Space. Optional PDF worksheets that students can use to solve math problems on paper first before typing them in.
  5. Answer Keys. Included for all activities.

Great for…

  • Spiral Review Lessons
  • Emergency Sub Plans
  • Homeschool Activities
  • Homework & Independent Practice
  • Learning Centers & After School Math Programs

Reviews for my Pixel Art products…

⭐⭐⭐⭐⭐ Kristy M. - ”My students love mystery pixel art activities and ask for them all the time! This is a great skill practice and students become more independent when using these.”

⭐⭐⭐⭐⭐ Teresa G. - “Great review resource for the beginning of unit, then harder level 2 practice as we moved along, self-checking pixel art helps so much!”

⭐⭐⭐⭐⭐ Carissa S. - “My students love being able to go online to learn once each week! This resource provided much needed additional practice! And my students loved it and were highly engaged.”

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A reminder about Google Drive products:

This is a Google Drive product. You and your students will need Google or Google Classroom accounts to access this resource.

After purchase, you'll access the resource via Google Drive:

  • TPT will request your permission to access your Google Drive. This is a standard permission process required by any website or platform that integrates with Google Drive.
  • TPT will make a copy of this resource and add it to your Google Drive.
  • The resource will be located in a folder in your Google Drive named "TPT Purchases."

Learn more about Google Drive products on the TPT knowledge base.

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Something not right?

If you have a question, or something is off with the lesson, please email me or post a question on TPT. I’ll do everything I can to make it right.

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License

Each license of this product is for one teacher’s classroom and their students. If you wish to share with other teachers, please purchase additional licenses.

If you're interested in a quote for a campus or district license, please email me.

Copyright © 2025 Congruent Math LLC. All rights reserved.

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