Unit 2, Lesson 3
Recubramos rectángulos
Grado 3
Preparation
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
- Comprehend the term “area” (in spoken and written language) as the number of square units that cover a flat figure with no gaps or overlaps.
- Explain (orally and in writing) how to use square tiles without gaps or overlaps to measure the area of a rectangle (within 24 square units).
- Match gridded rectangles that have the same area.
Required Preparation
- Each group of 2 students needs 25 square tiles.
- Create a set of cards from the blackline master for each group of 2 students.
Teacher Reflection Questions
Reflect on students’ counting strategies. What strategies are they comfortable using as they find area? What strategies could use more practice?