Lesson 4
Center Day 1
Lesson Purpose
The purpose of this lesson is to practice adding and subtracting within 100.
Lesson Narrative
In the first activity, students learn stage 3 of the How Close center. In this new stage, students add 2 two-digit numbers, trying to get as close to 100 as possible. In the second activity, students choose from previously introduced centers focused on two-digit numbers.
Learning Goals
Teacher Facing
- Add within 100.
- Compare addition and subtraction expressions to 20.
Student Facing
- Let’s practice adding and subtracting.
Required Materials
Materials to Gather
Materials to Copy
- How Close? Stage 3 Recording Sheet
Required Preparation
Activity 2:
- Gather materials from:
- Target Numbers, Stages 1–3
- Five in a Row, Stages 1–6
- Get Your Numbers in Order, Stage 1
Lesson Timeline
| Warm-up | 10 min |
| Activity 1 | 20 min |
| Activity 2 | 20 min |
| Lesson Synthesis | 10 min |
Teacher Reflection Questions
Identify something you thought was going to go well in math class recently, but did not. What can you do to make it a success next time?