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Perimeter - Find the Missing Side - Engaging Google Slides with Video Lesson
(74 ratings)$4.00
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Your students will love learning how to Find the Missing Side Lengths in Perimeter Problems. This resource includes a Video Lesson and Easy-to-Use Google Slides activities that are Perfect for Math Stations. This resource is designed for 3rd grade students and aligns to these standards: TEKS 3.7B and CCSS 3.MD.D.8.
This is Lesson 2 in the 3rd Grade Perimeter Series.
Here are links to the other lessons:
- 3rd Grade Perimeter Lesson 1: Using Addition to find Perimeter
- 3rd Grade Perimeter Lesson 2 (This Resource): Solve Multi-step Addition and Subtraction Problems to find Missing Side Lengths
- 3rd Grade Perimeter Lesson 3: Use Division to find Missing Side Lengths in Polygons with Equal Sides
- 3rd Grade Perimeter Lesson 4: Measure Sides to the Nearest cm or inch to find the Perimeter of Rectangles
You may also be interested in these lessons on Area:
2nd/3rd Grade Area Lesson 1: Understand the Concept of Area by filling Rectangles with Square Units
3rd Grade Area Lesson 2: Find Area by Multiplying the Number of Rows by the number of Unit Squares in Each Row
⭐ Student Devices must have access to You-Tube to view the Video Lesson ⭐
The Video Lesson in This Resource:
- Teaches students how find the missing side length in perimeter problems where the other side lengths and perimeter are known
- Shows students how to use a strip diagram as a visual model to solve problems
- Shows students how to break down these multi-step problems into 2 simple steps
- Walks students through the Google Slides activities they will complete
- Is approximately 7 minutes
⭐Many of the slides are self-checking, so students can work through the activity with confidence.
Topics and Activities Include:
- Creating Strip Diagrams to model multi-step perimeter problems
- Matching Activities
- Fun Slides with Movable pieces
- Application of Learning in Real-World Word Problems
- Word Problems have optional Step-by-Step support
What's Included?
- Video Lesson with Activity Instructions
- 10 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
CCSS.3.MD.D.8 Solve real world and mathematical problems involving perimeters of polygons, including finding the perimeter given the side lengths, finding an unknown side length, and exhibiting rectangles with the same perimeter and different areas or with the same area and different perimeters.
TEKS 3.7B Determine the perimeter of a polygon or a missing length when given perimeter and remaining side lengths in problems.
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Teacher reviews
“Looking forward to using it again this year! Thank you!”
“I have purchased many of these math activities, and love them all. Students are always engaged, and enjoy completing them.”
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4.8
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October 7, 2026"This resource is an absolute game-changer for teaching Unit 3 in 4th grade! If you are feeling overwhelmed by the dense teacher manuals or spending hours trying to format your own presentations, do yourself a favor and buy this right now. The slides are completely no-prep, beautifully designed, and student-friendly. Every single lesson includes clearly stated learning targets right at the beginning, which keeps my students focused and aligns perfectly with our instructional goals. I especially love the embedded anchor charts and direct hyperlinks—they save me so much transition time during lessons because I don’t have to hunt for materials across different tabs or manuals. The included student worksheets and guided practice prompts provide wonderful scaffolding that keeps student engagement high and supports all learners, including my emerging bilinguals and students who need extra support. It breaks down complex concepts into bite-sized, manageable pieces without watering down the curriculum. Thank you for creating such a polished, time-saving, and effective teaching tool! It has easily cut my planning time in half and made our daily lessons run seamlessly."
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Meet the Seller
In addition to my work in education, I also run a STEM-based Christmas Light Show business. When I'm not creating new math resources or working with teachers, I'm designing and fabricating light shows sequenced to music with my husband and our team. That business came about after our family was featured on ABC's The Great Christmas Light Fight. My son attends the University of Texas, Austin and I'm currently soaking up every last minute with my daughter, a high school senior.
San Antonio, Texas
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