Lesson 11

How Did You Do That?

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

  • Let’s add two-digit numbers and make sense of equations.

Required Preparation

CCSS Standards

Addressing

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?

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