# 3. Pool Sidewalk: Find area by dividing into known parts (A)

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.MP2 http://corestandards.org/Math/Practice/MP2

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Lesson objective: Apply the method of decomposing a figure.

This lesson provides an opportunity for students to apply their knowledge and understanding of decomposing figures into regions of known area to a real-life situation. Students are asked to create a pattern for a pool sidewalk and determine the area that will be covered by each color and the cost for their design.

Key Concept students will use:

• 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.

Skills students will use:

• finding the area of a rectangle (Grade 4, Unit 2).
• decomposing a figure into rectangles.

Students engage in Mathematical Practice 2 (Reason Abstractly and Quantitatively) as they determine which color blocks will provide a pleasing design and keep the cost of the project down.

Key vocabulary:

• area
• decompose

Special materials needed:

• Graph paper may be helpful for some students.
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