# Lesson 10

Solve Problems Involving Time (Part 1)

### Lesson Purpose

The purpose of this lesson is for students to solve problems involving addition and subtraction of time intervals in minutes in a way that makes sense to them.

### Lesson Narrative

In a previous lesson, students learned to tell and write time to the nearest minute. In this lesson, students reason about elapsed time using any representation that makes sense to them, such as the number line, tables, equations, and words. Students consider a variety of representations so that they can make connections and possibly use them in the next lesson (MP2).

- Action and Expression

- MLR7

Activity 1: Time at the Bus Stop

### Learning Goals

Teacher Facing

- Solve problems involving addition and subtraction of time intervals in minutes in a way that makes sense to them.

### Student Facing

- Let’s solve problems involving time.

### Required Preparation

### CCSS Standards

Addressing

### 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

How did you see students applying familiar representations to new situations in this lesson? How will you make use of their ideas as they solve problems involving time intervals in a future lesson?

### Suggested Centers

- Number Puzzles: Addition and Subtraction (1–4), Stage 5: Within 1,000 (Supporting)
- Target Numbers (1–5), Stage 7: Subtract Hundreds, Tens, or Ones (Supporting)