# Lesson 4

Día 1 de centros

### 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

• Compare addition and subtraction expressions to 20.

### Student Facing

• Practiquemos sumar y restar.

### Required Materials

Materials to Gather

Materials to Copy

• How Close? Stage 3 Recording Sheet, Spanish

### 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?