# Lesson 21

Investigación sobre el fin de semana (optional)

### Lesson Purpose

The purpose of this lesson is for students to apply their understanding of making line plots and using operations with fractions to analyze data.

### Lesson Narrative

This lesson is optional because it does not address any new mathematical content standards. This lesson does provide students with an opportunity to apply precursor skills of mathematical modeling. In this lesson, students brainstorm and define categories of how to spend time. Then they collect and represent data on a line plot. They analyze and describe the data to tell a story about the time use.

When students define categories, choose and ask questions, collect and analyze data, and tell a story about the situation based on data, they model with mathematics (MP4).

• Engagement
• MLR8

### Learning Goals

Teacher Facing

• Create line plots and use the information to solve problems.
• Solve problems involving addition and subtraction of fraction with unlike denominators.

### Student Facing

• Investiguemos a qué dedican el tiempo libre los estudiantes durante el fin de semana.

### Lesson Timeline

 Warm-up 10 min Activity 1 15 min Activity 2 20 min Lesson Synthesis 10 min

### Teacher Reflection Questions

As students worked together today, where did you see evidence of the mathematical community established over the course of the school year?

### Suggested Centers

• Rectangle Rumble (3–5), Stage 5: Fraction Factors (Addressing)
• Rolling for Fractions (3–5), Stage 4: Multiply Fractions (Supporting)