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:

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: **

**Special materials needed:**

- Graph paper may be helpful for some students.