# Lesson 11

¿Cómo lo hicieron?

### Lesson Purpose

The purpose of this lesson is for students to add 2 two-digit numbers, with composing a ten, using methods based on place value and properties of operation and make sense of equations that represent addition methods.

### Lesson Narrative

In previous lessons, students added 2 two-digit numbers using methods based on place value and properties of operations. In this lesson, students add 2 two-digit numbers and make sense of the equations that represent addition methods.

The cool-down should be completed before the lesson synthesis.

• Engagement
• MLR7

### Learning Goals

Teacher Facing

• Add 2 two-digit numbers using methods based on place value and properties of operations.
• Make sense of equations that represent addition methods.

### Student Facing

• Sumemos números de dos dígitos y démosle sentido a ecuaciones.

### Required Materials

Materials to Gather

### Lesson Timeline

 Warm-up 10 min Activity 1 15 min Activity 2 20 min Lesson Synthesis 10 min Cool-down 5 min

### Teacher Reflection Questions

How did your students represent their thinking today? How might you support them in creating more efficient representations?