Finding Perimeter and Geometric Thinking: Adding Side Length

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Adding of side lengths of polygons activity for 3rd grade Common Core State Standards for Mathematics. In this activities students explore real world problems regarding finding the perimeter of regular and irregular polygons. For example "Given the dimensions of a swimming pool, bordered by a sidewalk, and surrounded by grass, find the width of the sidewalk." The 3rd grade students explore and recognize the perimeter of polygons using algebraic thinking by using substitutions into equations that add side lengths. Students are asked to determine the unknown perimeter.

Geometric measurement: recognize perimeter.
CCSS.Math.Content.3.MD.D.8
Solve real world and mathematical problems involving perimeters of polygons, including finding the perimeter given the side lengths, finding an unknown side length, and exhibiting rectangles with the same perimeter and different areas or with the same area and different perimeters.

Includes:
Warm-Up: Recognizing Shapes
What shapes do you recognize below?
(Teacher: Click the parts of the bicycle that resemble familiar shapes to reveal an outline of the polygon.)

Vocabulary
Polygon
Regular Polygon
Perimeter

Vocabulary Review:
How many sides does the polygon have?
Teacher: Click the name of the polygons to reveal the number of sides.

Vocabulary Review:
What is the name of the polygon?
Teacher: Click the number of sides to reveal the name of the polygons.

(Teacher Menu to navigate through a variety of perimeter practice problems sorted by type of polygon.)
Triangles (8 practice problems/ 4 Multiple choice)
Squares (4 practice problems/ 4 Multiple choice)
Pentagons (4 practice problems/ 4 Multiple choice)
Quadrilaterals (13 practice problems/ 5 Multiple choice)
More Irregular Polygons (6 practice problems)
(52 total)

Sample practices includes scaffolding to recognize the perimeter by adding up the lengths of all the sides of a polygon to find the perimeter. Guided practices address multiple learning styles and includes multiple choice in most practices).

Created by: Nancy May Smith
November 25, 2013

nancymaysmith@gmail.com
Total Pages
63 pages
Included
Teaching Duration
90 minutes
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