Lesson 3
Tile Rectangles
Lesson Purpose
The purpose of this lesson is for students to measure area by counting square tiles and create rectangles with a given area.
Lesson Narrative
In previous lessons, students learned that counting square tiles that cover a figure gives the area of the figure in square units. In this lesson, students further explore tiling and learn that, when measuring area, squares that are used to tile a figure can't overlap. They learn that the area is the number of square units that cover a flat figure with no gaps or overlaps. Students also create rectangles of a specific area on grids to demonstrate they understand that rectangles covered by the same number of square units without gaps or overlaps have the same area.
Students should have access to square tiles throughout the lesson and also be encouraged to draw the partitioned rectangles they create with the tiles.
 Representation
 MLR8
Learning Goals
Teacher Facing
 Explain that rectangles that can be covered by the same number of unit squares without gaps or overlaps have the same area.
 Find the area of rectangles (within 24 square units) by counting unit squares.
Student Facing
 Let’s count square tiles.
Required Materials
Required Preparation
Activity 1:
 Each group of 2 needs 24 square tiles.
Activity 2:
 Create a set of cards from the blackline master for each group of 2.
CCSS Standards
Addressing
Lesson Timeline
Warmup  10 min 
Activity 1  15 min 
Activity 2  20 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
Reflect on students’ counting strategies. What strategies are they comfortable using as they find area? What strategies could use more practice?
Suggested Centers
 Can You Build It? (3–5), Stage 1: Rectangles (Addressing)
 Five in a Row: Multiplication (3–5), Stage 1: Factors 1–5 and 10 (Supporting)
Print Formatted Materials
For access, consult one of our IM Certified Partners.
Additional Resources
Google Slides  For access, consult one of our IM Certified Partners. 

PowerPoint Slides  For access, consult one of our IM Certified Partners. 