# Lesson 3

Recubramos rectángulos

### 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

- Contemos fichas cuadradas.

### 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

Warm-up | 10 min |

Activity 1 | 15 min |

Activity 2 | 20 min |

Lesson Synthesis | 10 min |

Cool-down | 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

Teachers with a valid work email address can click here to register or sign in for free access to Cool Down, Teacher Guide, and PowerPoint materials.

Student Task Statements | docx | |

Lesson Cover Page | docx | |

Cool Down | Log In | |

Teacher Guide | Log In | |

Teacher Presentation Materials | docx | |

Blackline Masters | zip |