Lesson 1

In grade 3, students learned how to find the area of a rectangle by tiling and found that multiplying the side lengths yields the same result.

The purpose of this lesson is for students to apply their understanding of area and multiplication to build rectangles and find their area. As students consider the areas of rectangles with a given side length, they explore the idea of multiples. Students learn that a multiple of a number is the result of multiplying that whole number by another.

While students are introduced to the term multiple in this lesson, they work more with it in upcoming lessons. They do not need to have a formal understanding of the term in this lesson. In upcoming lessons, students also explore and learn the terms factor and factor pair. In this lesson, they refer to them as side lengths within the context of area.

Math Community

Prepare a space, such as a piece of poster paper, titled “Comunidad matemática” // “Mathematical Community”​ ​and a T-chart with the headers “Hacer matemáticas” // “Doing Math”​​ ​and “Normas” // “Norms” as shown here.

The two sections encourage the students and teacher to be mindful that both respective parties are responsible for the way math is done in the classroom.

Activity 2: ¿Qué áreas pueden construir?

• Each group of 2 needs at least 36 tiles.

• Each group of 2 needs at least 36 tiles from the previous activity.