Lesson 8

Different Representations of Tens and Ones

Lesson Purpose

The purpose of this lesson is for students to interpret base-ten representations of two-digit numbers.

Lesson Narrative

In previous lessons, students learned that the digit on the left of a two-digit number tells the number of tens and the digit on the right tells the number of ones.

In this lesson, students interpret three different base-ten representations: base-ten diagrams, _____ tens _____ ones, and addition expressions that represent the value of each digit. This is the first time students see expressions representing two-digit numbers other than 10 + n expressions representing teen numbers. Students match representations that show the same value.

At this time, students are not expected to write two-digit numbers, but continue to make sense of how to read and say them based on their base-ten structure. The teacher should record two-digit numbers when students say them.

  • Engagement
  • MLR7

Activity 1: Compare Representations of a Collection

Learning Goals

Teacher Facing

  • Interpret different base-ten representations of two-digit numbers (drawings, words, and addition expressions).

Student Facing

  • Let’s think about how two-digit numbers can be shown.

Required Materials

Materials to Gather

Materials to Copy

  • Grab and Count Stage 2 Recording Sheet
  • Representations of Tens and Ones

Required Preparation

Activity 2:

  • Create a set of cards from the blackline master for each group of 2–4.

CCSS Standards

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 was the best question you asked students today? Why would you consider it the best one based on what students said or did?

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