Lesson 9

Lesson Purpose

The purpose of this lesson is for students to represent the base-ten structure of two-digit numbers with drawings, words, and addition expressions that show the value of the tens and ones.

Lesson Narrative

In previous lessons, students interpreted different ways to represent a two-digit number as some tens and some ones. In this lesson, students create a collection with connecting cubes to represent a two-digit number and use what they have learned in previous lessons to represent the collection in as many ways as they can. They participate in a gallery walk in which they observe other collections, represent the collections in as many ways as they can, and compare their representations with their partner.

• Action and Expression

Learning Goals

Teacher Facing

• Represent the base-ten structure of two-digit numbers with drawings, words, and addition expressions.

Student Facing

• Let’s show numbers in different ways.

Required Preparation

Activity 2:

• Students’ collections from the previous activity are needed for the gallery walk.

Activity 3:

• Gather materials from previous centers:
• Grab and Count, Stage 2
• Shake and Spill, Stages 3–5
• Check It Off, Stages 1–3

Lesson Timeline

 Warm-up 10 min Activity 1 10 min Activity 2 15 min Activity 3 15 min Lesson Synthesis 10 min Cool-down 0 min

Teacher Reflection Questions

What unfinished learning or misunderstandings do your students have about representing tens and ones? How did you leverage those misconceptions in a positive way to further the understanding of the class?

Print Formatted Materials

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