Shark Learning
Log In
Grade 3/Geometry

Find the Missing Side from Perimeter: Multiple Choice

Use the perimeter formula to solve for the unknown side length of rectangles.
6
Sheets
2109
Views
198
Downloads
Study Guide
WorksheetsTeacher InfoLearning Path

Preview

Find the Missing Side from Perimeter: Multiple Choice preview

Tap to open PDF

#WorksheetQuestionsActions
Easy
1
10 questions
2
10 questions
Medium
1
10 questions
2
10 questions
Hard
1
10 questions
2
10 questions
What to Do Next
Compare Area and Perimeter Statements: Multiple Choice7 WS
Rectangle A is 8 units by 3 units. Rectangle B is 6 units by 4 units. Which statement is true?
Area and Perimeter Mixed Practice: Multiple Choice8 WS
The Coral Reef Stage floor is a rectangle measuring 12 m by 7 m. How many square meters of foam flooring are needed? 🎤

Practice Questions

  1. A rectangle has a perimeter of 26 units. Its length is 8 units. What is its width?
    Show answer

    (C) 5 units

  2. A rectangle has a perimeter of 24 units. Its width is 5 units. What is its length?
    Show answer

    (D) 7 units

  3. A rectangle has a perimeter of 32 units. Its length is 11 units. What is its width?
    Show answer

    (B) 5 units

  4. A rectangle has a perimeter of 28 units. Its width is 9 units. What is its length?
    Show answer

    (D) 5 units

  5. A rectangle has a perimeter of 30 units. Its length is 7 units. What is its width?
    Show answer

    (D) 8 units

Teacher Resources
Standards
CCSS.MATH.CONTENT.3.MD.C.5
Teaching Notes

Emphasize using the perimeter formula P=2(L+W). Guide learners through inverse operations to isolate the unknown side.

Vocabulary
Perimeter: The total distance around a shape.
Side length: The measurement of one edge of a shape.
Common Mistakes
  • Forgetting to divide the perimeter by 2 first
  • Subtracting the known side twice
  • Mixing up which side is missing
  • Forgetting to divide perimeter by two
  • Calculation errors during subtraction
  • Mixing up length and width
Differentiation
SupportUse manipulatives or drawings to visualize rectangles.
ChallengeIntroduce word problems or non-rectangular shapes.
Discussion Questions
  • What is the definition of perimeter?
  • Why do we divide the perimeter by two?
  • How is this skill useful in real life?
  • What if the shape was a square?
Extension Activities
  • Draw different rectangles with the same perimeter.
  • Find missing sides of irregular shapes.
Parent Tip

Walk around your house and count steps to estimate perimeter.

Learning Path
Skill Cluster

Geometry and Measurement

Estimated Time

14 minutes

Skills Practiced
Solving for an unknown side using perimeterWriting and solving two-step equationsChecking whether answers are reasonable