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Lesson Plan

2. Decompose figures to find area (FP)

teaches Common Core State Standards CCSS.Math.Content.6.G.A.1 http://corestandards.org/Math/Content/6/G/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
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Lesson objective: Decompose figures to find the total area.

This lesson helps to build procedural skill with decomposing figures to find areas. Drawing a diagram is used here because it supports students’ ability to visualize the process. This work develops students' understanding that area is additive, meaning the area of a figure is the same as the sum of the area of non-overlapping regions of the figure.

Students engage in Mathematical Practice 4 (Model with mathematics) as they view, manipulate, and create models to represent decomposing the figures.

 

Key vocabulary:

  • area
  • decompose

Special materials needed:

  • Graph paper may be helpful for some students.
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Problem solving with area in 2-D shapes

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