Find the Missing Side from Area
Browse 0 free printable Find the Missing Side from Area worksheets for Third 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 Third curriculum, or a tutor helping a student catch up, these free printable worksheets are ready to use today.
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Practice Questions
- A rectangle has area 18 cm². Its length is 3 cm. What is the other side?
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6 cm
- A rectangle has area 20 ft². Its width is 5 ft. What is the other side?
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4 ft
- A rectangle has area 21 cm². Its length is 7 cm. What is the other side?
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3 cm
- A rectangle has area 24 ft². Its width is 6 ft. What is the other side?
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4 ft
- A rectangle has area 16 cm². Its length is 4 cm. What is the other side?
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4 cm
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Quick Tip
Teacher Resources
Teaching Notes
Introduce area as covering a surface and connect it to multiplication. Emphasize that finding a missing side requires the inverse operation, division.
Vocabulary
Common Mistakes
- Confusing area with perimeter calculations.
- Incorrect multiplication or division fact recall.
- Multiplying dimensions when division is needed for a missing side.
Differentiation
Discussion Questions
- How does knowing the area help us find a missing side?
- Can you think of a real-world situation for this skill?
- What is the relationship between multiplication and division here?
- How is this like finding a missing factor in an equation?
Extension Activities
- Find missing sides with decimals.
- Use area to find perimeter.
- Create problems for others.
Parent Tip
Give your child a rectangular placemat and ask them to find a missing side if you give the area.
Learning Path
Skill Cluster
Geometry and Measurement
Estimated Time
15 minutes