# Lesson 4

Center Day 1

### Lesson Purpose

The purpose of this lesson is for students to practice adding within 100 without composing a ten.

### Lesson Narrative

In the first activity, students learn stage 3 of the Number Puzzles center. In this new stage, students use digit cards to make addition equations within 100 without composing a ten. In the second activity, students choose from center activities that focus on adding within 100.

• MLR8

### Learning Goals

Teacher Facing

• Add within 100, without composing a ten.

### Student Facing

• Let’s add within 100.

### Required Materials

Materials to Gather

Materials to Copy

• Number Puzzles Addition and Subtraction Stage 3 Gameboard

### Required Preparation

Activity 1:

• Each group of 2 needs a set of digit cards from the previous center, Number Puzzles.

Activity 2:

• Gather materials from previous centers:
• Number Puzzles, Stages 1-3
• Five in a Row, Stages 1-5
• Greatest of Them All, Stage 1

### Lesson Timeline

 Warm-up 10 min Activity 1 15 min Activity 2 25 min Lesson Synthesis 10 min

### Teacher Reflection Questions

How are students working together during center time? Are all students getting the opportunity to participate in the mathematics?

### Print Formatted Materials

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