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Shodor Education Foundation
Shodor Interactivate: Lesson: Perimeter (Elementary)
In this lesson students will practice finding the perimeter of regular and irregular shapes with right angles and the appropriate units for measuring perimeter.
Better Lesson
Better Lesson: Comparing Lengths
At the completion of this lesson, 3rd graders will understand how to compare the lengths of various objects. This lesson plan has detailed instructions that include pictures and videos.