# Lesson 17

Día 3 de centros

### Lesson Purpose

The purpose of this lesson is for students to work with shapes and addition and subtraction.

### Lesson Narrative

In the first activity, students learn stage 2 of the Which One center, which was first introduced in kindergarten. In this new stage, students ask yes or no questions about shapes in order to identify the shape their partner chose. In the second activity, students choose from previously introduced centers focused on shapes or addition and subtraction.

### Learning Goals

Teacher Facing

• Describe two-dimensional and three-dimensional shapes.
• Subtract within 10.

### Student Facing

• Trabajemos con figuras y números.

### Required Materials

Materials to Gather

Materials to Copy

• Which One Stage 2 Gameboard

### Required Preparation

Activity 2:

Gather materials from previous centers:

• Can You Draw It, Stage 1
• Match Mine, Stage 2
• Capture Squares, Stages 1 and 2
• Target Numbers, Stages 1-3

### Lesson Timeline

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

### Teacher Reflection Questions

As students worked together today, where did you see evidence of the mathematical community established over the course of the school year?