Unit 1, Lesson 17
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 the first activity, students revisit Stage 3 of the Counting Collections center, which was first introduced in Kindergarten. In this stage, called Estimate and Count Up to 120, students count collections of up to 120 objects and represent how they counted. In the second activity, students choose between two previously introduced centers focused on adding and subtracting within 50 or representing data with graphs.
- Explain (orally) a strategy for counting and representing a collection of up to 120 objects.
- Let’s count objects, play addition games, and create graphs.
Required Materials
Activity 2
Required Preparation
- Each group of 2 needs a collection of 100–120 objects.
Gather materials from previous centers:
- What’s Behind My Back, Stages 2 and 3
- How Close, Stages 1–3
- Number Puzzles, Stages 1 and 2
- Sort and Display, Stage 2
Suggested Centers
NoneTeacher Reflection Questions
What did students show you they understand about place value in today’s lesson? How can you use what you learned today about your students in your upcoming lessons?