Lesson plan

Solve for perimeter by using standard units

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 the measure of the distance around a two-dimensional shape. The length of the perimeter of a polygon is the sum of the lengths of the sides. This lesson builds on developing students' understanding of perimeter and shape attributes. Students will describe, analyze, and examine the perimeter of squares and rectangles. This task requires students to reason and make sense of the characteristics and relationships between shapes and perimeter. Students are presented with a scenario in which they have to determine if there is enough ribbon to decorate the border of two picture frames. They have to consider the shape's properties and find its perimeter by examining the lengths of its sides. This builds toward the ability to apply perimeter formulas for rectangles in real-world and mathematical problems. Vocabulary: perimeter, standard unit, inch, centimeter, distance, length Special Materials: Printout of the picture frames Dot paper or graph paper (optional) Inch and centimeter ruler (or measuring tape)