# Lesson 10

Longitudes de lado fraccionarias y menores que 1

### Lesson Purpose

The purpose of this lesson is for students to find the area of rectangles with one non-unit fractional side length and one whole number side length.

### Lesson Narrative

- Representation

- MLR2

### Learning Goals

Teacher Facing

- Find the area of a rectangle with one non-unit fractional side length.
- Represent the area of a rectangle with a multiplication expression.

### Student Facing

- Encontremos el área de rectángulos que tienen un lado de longitud fraccionaria.

### Required Preparation

### CCSS Standards

### Lesson Timeline

Warm-up | 10 min |

Activity 1 | 20 min |

Activity 2 | 15 min |

Lesson Synthesis | 10 min |

Cool-down | 5 min |

### Teacher Reflection Questions

In the next lesson, students will find the area of a rectangle where one of the side lengths is a fraction greater than 1. Try finding the area of a rectangle that is \(\frac{5}{4}\) by 6. How do the understandings in today’s lesson support how you found the area of that rectangle?

### Suggested Centers

- Target Measurements (2–5), Stage 5: Fractions of Angles (Addressing)
- How Close? (1–5), Stage 6: Multiply to 3,000 (Supporting)