Reflection: Developing a Conceptual Understanding Decomposing Rectangles to Find Area - Section 1: Opening Activity


After teaching this lesson, I would have opened my lesson differently! Some of my students struggled with making the connection: one square on my graph paper equals one square foot.

Here's what I would have done!

1. Create a 3ft x 4ft rectangle on the floor using blue painters tape.

2. Purchase twelve square feet of laminate flooring (Square Foot Tile).

3. Hand tiles out to each set of 2-3 students. Ask students to use their rulers to answer the question: How big do you think this tile is? (1 ft x 1 ft = 1 square foot)

4. Ask students to guess how many square foot tiles will cover the floor of the room inside the blue tape.

5. After discussing student guesses, allow students to demonstrate how to use the tiles to figure how many tiles will fit exactly. This will help students envision how big a square foot is and connect the squares on their grid paper to the size of their rooms in real life. 

  Developing a Conceptual Understanding: How Big is a Square Foot?
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Decomposing Rectangles to Find Area

Unit 14: Area & Perimeter
Lesson 6 of 19

Objective: SWBAT use smaller rectangles to find the area of a larger rectangle.

Big Idea: Students will practice decomposing rooms into smaller rectangles in order to determine the area of the room.

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anchor chart decomposing rooms
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