# Lesson 15

Ways to Solve Problems and Show Solutions

### Lesson Purpose

The purpose of this lesson is for students to solve problems using the four operations as they imagine spending a day at the fair.

### Lesson Narrative

In previous lessons, students became familiar with and solved problems involving equal groups, time, weight, and liquid volume. In this lesson, students put together the ideas they have learned to consider a variety of mathematical situations that might arise during a day at the fair. Students solve problems as they imagine the course of a day at the fair and create a poster to highlight their mathematical reasoning.

- Action and Expression

- MLR7

### Learning Goals

Teacher Facing

- Analyze strategies for solving problems and for presenting solutions.
- Use the four operations to solve one-step word problems involving measurements.

### Student Facing

- Let’s solve problems about spending a day at the fair and think about how to best show our solutions.

### Required Materials

Materials to Gather

### Required Preparation

Activity 2:

- Display posters from the previous activity.

### Lesson Timeline

Warm-up | 10 min |

Activity 1 | 25 min |

Activity 2 | 10 min |

Lesson Synthesis | 10 min |

Cool-down | 5 min |

### Teacher Reflection Questions

As you finish up this unit, reflect on the norms and activities that have supported each student in learning math. How have you seen each student grow as a young mathematician throughout this work? How have you seen yourself grow as a teacher? What will you continue to do and what will you improve upon in the next unit?

### Suggested Centers

- Compare (1–5), Stage 3: Multiply within 100 (Supporting)
- How Close? (1–5), Stage 5: Multiply to 100 (Supporting)