Missing Side from Perimeter
Browse 5 free printable Missing Side from Perimeter worksheets for Grade 3 Math. These Geometry worksheets are designed to give students targeted practice and build confidence in math.
Worksheets are available at multiple difficulty levels — Easy, Medium, and Hard — so you can meet every student where they are. Each worksheet is an instant PDF download: print as many copies as you need for your classroom, tutoring sessions, or home practice at no cost.
Whether you're a teacher looking for geometry practice problems, a homeschool parent building a Grade 3 curriculum, or a tutor helping a student catch up, these free printable worksheets are ready to use today.
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Practice Questions
- What is the missing side? Perimeter = 16 ft
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(A) 4 ft
- What is the missing side? Perimeter = 14 cm
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(B) 2 cm
- What is the missing side? Perimeter = 18 ft
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(A) 3 ft
- What is the missing side? Perimeter = 10 cm
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(B) 5 cm
- What is the missing side? Perimeter = 17 ft
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(A) 2 ft
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Quick Tip
Teacher Resources
Teaching Notes
Introduce perimeter as the total distance around a shape. Guide learners to sum known sides and subtract from the given total perimeter to find the missing length.
Vocabulary
Common Mistakes
- Forgetting to add all known side lengths before subtracting.
- Subtracting from a known side instead of the total perimeter.
- Misidentifying which sides are known or unknown on the diagram.
Differentiation
Discussion Questions
- What does 'perimeter' mean in your own words?
- Why is it helpful to know the perimeter of a shape?
- How is finding a missing side length different from just finding the perimeter?
- Can two different shapes have the same perimeter?
Extension Activities
- Draw shapes with given perimeters.
- Find missing sides of irregular shapes.
- Calculate perimeter of real objects.
Parent Tip
Help your child measure the edges of objects around the house.
Learning Path
Skill Cluster
Measurement and Geometry
Estimated Time
15 minutes