Finding Missing Side Lengths
Grade 3 · Math · 45 min
What's Included
Learning Objective
I can use addition and subtraction to find the unknown side length of a polygon.
Warm-Up Video
Unknown Channel · 5:00
Finding Perimeter when a Side Length is Missing (Composite Figures) | Math with Mr. J
Practice Questions
7 questions · Short answer
Exit Ticket
Quick comprehension check
“A shape has a top side of 6 cm. The bottom side has two parts. One part is 2 cm. What is the length of the other part of the bottom side if the entire bottom side is 6 cm? A shape has a left side of 8 inches. The right side has two parts. One part is 3 inches. What is the length of the other part of the right side if the entire right side is 8 inches? A shape has a side that is 10 meters long. This side is made up of two smaller parts. If one part is 4 meters long, how long is the other part?”
Teacher Guide
Get the complete package:
- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
