Lesson 19
Situations and Equations
Lesson Purpose
The purpose of this lesson is for students to represent and solve two-step word problems.
Lesson Narrative
In this lesson, students are able to apply what they have learned in this section to write equations that represent two-step word problems using a letter for the unknown quantity. They persevere to solve two-step word problems, and decide if their answer makes sense (MP1).
- Engagement
- MLR5
Learning Goals
Teacher Facing
- Represent and solve two-step word problems using equations with a letter standing for the unknown quantity.
Student Facing
- Let’s represent and solve problems.
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
Who has been sharing their ideas in class lately? Make a note of students whose ideas have not been featured in class and look for an opportunity for them to share their thinking in tomorrow’s lesson.
Suggested Centers
- Tic Tac Round (3–5), Stage 1: Nearest Ten or Hundred (Addressing)
- Number Puzzles: Addition and Subtraction (1–4), Stage 5: Within 1,000 (Addressing)
- Five in a Row: Multiplication (3–5), Stage 2: Factors 1–9 (Supporting)