# Lesson 17

Center Day 3 (optional)

### Lesson Purpose

The purpose of this lesson is for students to count large groups of objects by creating smaller groups of 5 or 10. Students practice adding within 50 or representing data with graphs.

### Lesson Narrative

This lesson is optional because it is an opportunity for extra practice that not all classes may need. In Activity 1, students revisit stage 3 of the Counting Collections, 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 Activity 2, students choose between two previously introduced centers focused on adding and subtracting within 50 or representing data with graphs.

### Learning Goals

Teacher Facing

• Count large collections of objects.
• Represent data using picture and bar graphs.

### Student Facing

• Let’s count large groups of objects and play games to practice adding and creating graphs.

### Required Materials

Materials to Gather

Materials to Copy

• Counting Collections Stage 3 Recording Sheet
• 10-Frame Standard

### Required Preparation

Activity 1:

• Each group of 2 needs a collection of 100–120 objects.

Activity 2:

Gather materials from:

• 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

### Lesson Timeline

 Warm-up 10 min Activity 1 20 min Activity 2 25 min Lesson Synthesis 10 min

### Teacher 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?

### Print Formatted Materials

 Student Task Statements pdf docx Lesson Cover Page pdf docx Teacher Guide Log In Teacher Presentation Materials pdf docx Blackline Masters zip