Lesson plan

15. Gwen's Fence: Create side lengths of a rectangle given its perimeter (A)

teaches Common Core State Standards CCSS.Math.Content.3.MD.D.8 http://corestandards.org/Math/Content/3/MD/D/8
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8
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Lesson objective: Generate side lengths for possible rectangles that have a given perimeter.

This lesson provides an opportunity for students to apply their knowledge and understanding of perimeter to a real-life situation. Students are asked to create plans for an animal pen by generating dimensions of rectangles that have a perimeter of 100 meters.

Key Concept students will use: 

  • Perimeter is the sum of the length of the sides of a polygon.

Skills students will use:

  • Adding and subtracting fluently within 100 (Grade 2, Unit 15)
  • Calculating perimeter 

Students engage in Mathematical Practice 8 (Look for and express repeated reasoning) as they generate side lengths of rectangles that will all have the same perimeter.

Key vocabulary: 

  • dimensions
  • length
  • perimeter
  • rectangle
  • side
  • width