Lesson 21
Solve Problems Using the Four Operations
Lesson Purpose
The purpose of this lesson is for students to represent and solve two-step word problems using the four operations.
Lesson Narrative
Previously, students have represented and solved two-step word problems using addition, subtraction, multiplication, and division with smaller numbers. In this lesson, students continue to deepen their understanding of two-step word problems as they consider what they need to know to solve problems and think about the relationship between numbers in a problem. Students write equations with a letter standing for the unknown quantity to represent these problems.
- Action and Expression
- MLR8
Activity 1: Apple Adventure
Learning Goals
Teacher Facing
- Represent two-step word problems using equations with a letter standing for the unknown quantity.
- Solve two-step word problems using the four operations.
Student Facing
- Let’s represent and solve problems using all four operations.
Required Preparation
CCSS Standards
Addressing
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
Check in with your norms and routines. Are they promoting engagement from all your students? Are there any adjustments you might make so that all students do math tomorrow?