# Lesson 4

Día 1 de centros (optional)

### Lesson Purpose

The purpose of this lesson is for students to practice addition and subtraction within 100 that does not require composing or decomposing a ten.

### Lesson Narrative

This lesson is optional because it is an opportunity for extra practice that not all classes may need. Students learn new stages of centers that were introduced in grade 1. In Activity 1, students learn stage 3 of the Capture Squares center. In this new stage, called Add within 20, students find the value of sums within 20. In Activity 2, students learn stage 6 of the Five in a Row center. In this stage, students practice finding the value of sums within 100 that require composing when adding by place.

### Learning Goals

Teacher Facing

• Add and subtract within 100.

### Student Facing

• Juguemos juegos para practicar sumas y restas.

### Required Materials

Materials to Gather

Materials to Copy

• Five in a Row Addition and Subtraction Stage 6 Gameboard, Spanish
• Capture Squares Stage 3 Gameboard, Spanish
• Capture Squares Stage 3 Spinner, Spanish

### Lesson Timeline

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

### Teacher Reflection Questions

Identify ways the math community you are working to foster is going well. What aspects would you like to work on? What actions can you take to improve those areas?