Unit 7, Lesson 18
Center Day 3 (Optional)
Grade 2
Preparation
Lesson Narrative
This lesson is optional because it is an opportunity for extra practice that not all classes may need. In Activity 1, students learn Stage 6 of the Target Numbers center. In this new stage, called Target Numbers—Add Hundreds, Tens, or Ones, students add hundreds, tens, and ones to get as close to 1,000 as possible. In Activity 2, students learn Stage 7 of the Target Numbers center, called Target Numbers—Subtract Hundreds, Tens, or Ones. Then they choose to continue working on Target Numbers, or choose between two previously introduced centers that focus on addition and subtraction within 1,000.
- Explain (orally) strategies for adding and subtracting within 1,000 based on place value.
- Let’s add and subtract 3-digit numbers.
Required Preparation
Each group of 2 students needs 3 number cubes.
- Each group of 2 students needs 3 number cubes.
- Gather materials from:
- Target Numbers, Stage 6
- Five in a Row, Stages 7 and 8
- How Close? Stage 4
Suggested Centers
NoneTeacher Reflection Questions
Reflect on whose thinking was heard today. Reflect on whose thinking was not heard but could have enriched the conversations. What prompts or structures might better enable the latter to share their voices and reasoning?