Grade 3/Geometry
Perimeter of Rectangles: Multiple Choice (707)
Use the perimeter formula P = 2 × (length + width) for rectangles.
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Standards
CCSS.MATH.CONTENT.3.MD.C.5Teaching 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
Prerequisites
- Counting perimeter on grids
- Addition of Whole Numbers
- Multiplication of Whole Numbers
- Understanding Length and Width
Next Steps
- Area of Rectangles
- Perimeter of Other Polygons
- Finding Missing Side Lengths (Perimeter)
- Area of Rectangles (Side Lengths)
- Perimeter of Polygons
- Perimeter: Find Missing Side