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Grade 3/Geometry

Perimeter of Rectangles: Multiple Choice

Use the perimeter formula P = 2 × (length + width) for rectangles.
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What to Do Next
Area of Rectangles: Multiple Choice9 WS
What is the area of a rectangle with length 4 units and width 3 units?
Perimeter of Irregular Shapes5 WS
Count the outside edges to find the perimeter of the shaded L-shape.

Practice Questions

  1. A rectangle has a length of 5 units and a width of 3 units. What is its perimeter?
    Show answer

    (B) 16 units

  2. A rectangle has a length of 7 units and a width of 4 units. What is its perimeter?
    Show answer

    (B) 22 units

  3. A rectangle has a length of 9 units and a width of 2 units. What is its perimeter?
    Show answer

    (C) 22 units

  4. A rectangle has a length of 6 units and a width of 6 units. What is its perimeter?
    Show answer

    (B) 24 units

  5. A rectangle has a length of 8 units and a width of 5 units. What is its perimeter?
    Show answer

    (B) 26 units

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

Emphasize understanding the formula's components. Relate perimeter to real-world boundaries or fences.

Vocabulary
Perimeter: The distance around a shape.
Length: The longer side of a rectangle.
Width: The shorter side of a rectangle.
Common Mistakes
  • Doubling only one side instead of the sum
  • Forgetting units in the final answer
  • Mixing up perimeter with area
  • Forgetting units.
  • Adding only two sides.
  • Incorrect formula use.
  • Calculation errors.
Differentiation
SupportUse grid paper to visualize sides and add them.
ChallengeFind missing side given perimeter and one side.
Discussion Questions
  • What does 'perimeter' mean?
  • When is calculating perimeter useful?
  • How is perimeter different from area?
  • Can a square be a rectangle? Why?
Extension Activities
  • Find perimeter of objects.
  • Draw shapes with given perimeter.
  • Compare perimeters.
Parent Tip

Walk the perimeter of a room with your child, counting steps.

Learning Path
Skill Cluster

Measurement & Geometry

Estimated Time

12 minutes

Skills Practiced
Applying the perimeter formula for rectanglesAdding length and width before doublingIncluding measurement units in answersRecognizing squares as special rectangles