Lesson 11
Solve Problems Involving Time (Part 2)
Lesson Purpose
The purpose of this lesson is for students to solve problems involving addition and subtraction of time intervals in minutes.
Lesson Narrative
In this lesson, students use any strategy and representation to solve problems involving elapsed time. The problems involve unknowns in all positions: start time, end time, and duration. When students recognize the mathematical features of familiar real-world objects and use those features to solve problems, they model with mathematics (MP4).
- Representation
- MLR8
Learning Goals
Teacher Facing
- Solve problems involving addition and subtraction of time intervals in minutes.
Student Facing
- Let’s solve more problems involving time.
Required Materials
Materials to Gather
Required Preparation
Activity 1:
- Display students’ ideas from the lesson synthesis in the previous lesson.
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
Who got to do math today in class and how do you know? Identify the norms or routines that allowed those students to engage in mathematics. How can you adjust these norms and routines so all students do math tomorrow?
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)