Lesson plan

Find the unknown side length by applying algebraic strategies when the perimeter is given

teaches Common Core State Standards CCSS.Math.Content.3.G.A.1 http://corestandards.org/Math/Content/3/G/A/1
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.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Big Ideas: Perimeter is a measurement of length around a two dimensional figure. If the perimeter is known, there are strategies to determine a polygon's unknown length. This lesson builds on developing students' understanding of perimeter and shapes attributes. This task requires students to use strategies to find unknown side lengths and make sense of the characteristics and relationships between shapes and perimeter. Students will describe, analyze, and examine the perimeter and the attributes of squares and rectangles. Students are presented with a shape and asked to use strategies to find unknown side lengths by examining the lengths of the known sides and the perimeter provided. This builds toward the ability to apply perimeter formulas for rectangles in real-world and mathematical problems. Vocabulary: perimeter, variable, inverse operation, distance, length Special Materials: Inch tiles(optional) Geoboard(optional) Dot paper or graph paper(optional)