Area and Perimeter January 2013 Elementary Coaches Meeting By PresenterMedia.comPresenterMedia.com

Agenda Just in time content Discussion Item One – 4 th grade PARCC example Discussion Item Two – Rectangle Activity Conservation of Area Discussion Item Four –Fixed Area Activity Do figures with the same area have the same perimeter? Discussion Item Five – Resources Questions and Answers 10 min 15 min 10 min Discussion Item Three – Fixed Perimeter Activity Do figures with the same perimeter have the same area?

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AREA Area is the two-dimension space inside a region. Data from NAEP suggest that students have an incomplete understanding. Perimeter is the distance around a region. Although perimeter is a 3 rd grade standard, only 71% of 8 th graders accurately identified the perimeter on the NAEP assessment. Students are taught formulas without understanding. PERIMETER Area and Perimeter A continual source of confusion

Fold and cut rectangle on the diagonal, making two identical triangles. Arrange the triangles into different shapes. Only sides of the same length can be matched up and must match exactly. Find all six shapes. Does one shape have a greater area? How do you know? Rectangle Activity

Although each figure is a different shape, all the figures have the same area. This is not an obvious concept for K-2 students. Conservation of Area

What different sized rectangles can be made with a perimeter of 24 units? Create as many different rectangles with a perimeter of 24. Build and label each rectangle with its perimeter and its area. What discoveries did you make? Fixed Perimeter Do Figures with the same perimeter have the same area?

How many rectangles can be made with an area of 36 sq. units? Fixed Area Do figures with the same area have the same perimeter? What do all the figures with smaller perimeter have in common ? What do all the figures with large perimeter have in common?

Resources Perimeter and Area lessons

Questions