10. Solving word problems by splitting rectilinear figures (A)

teaches Common Core State Standards CCSS.Math.Content.3.MD.C.7d http://corestandards.org/Math/Content/3/MD/C/7/d
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Lesson objective: Solve area problems in which the figure is rectilinear.

This lesson provides an opportunity for students to apply their knowledge and understanding of area of a rectilinear figure to a real-life situation. Students are asked to draw a design for a rectilinear park.

Key Concept students will use:

• We can decompose rectilinear figures because area is additive.

Skills students will use:

• area
• decomposing rectangles
• multiplication

Students engage in Mathematical Practice 8 (Look for and express regularity in repeated reasoning) as they use the area model to create a rectilinear figure.

Key vocabulary:

• area
• area model
• factors
• multiplication
• rectangle

Special materials needed:

• graph paper
• square tiles
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