Lesson 21
Center Day 3
Lesson Purpose
The purpose of this lesson is for students to practice adding within 20.
Lesson Narrative
In Activity 1, students learn stage 1 of the center, How Close? In Activity 2, students learn stage stage 3 of the center, Five in a Row. In both activities, students have opportunities to apply methods and concepts from the section such as counting on, making a ten, adjusting addends (using known facts), and using the commutative and associative properties.
- Action and Expression
- MLR8
Learning Goals
Teacher Facing
- Students add two and three numbers within 20.
- Students write equations with three addends.
Student Facing
- Let’s play games where we add and subtract.
Required Materials
Materials to Gather
Materials to Copy
- Five in a Row Addition and Subtraction Stage 3 Gameboard
- How Close? Stage 1 Recording Sheet
Required Preparation
Lesson Timeline
| Warm-up | 10 min |
| Activity 1 | 20 min |
| Activity 2 | 20 min |
| Lesson Synthesis | 10 min |
Teacher Reflection Questions
What methods are students using to add three numbers? What questions have you asked to encourage them to make a ten?