Lesson 8
Different Representations of Tens and Ones
Lesson Purpose
The purpose of this lesson is for students to interpret baseten representations of twodigit numbers.
Lesson Narrative
In previous lessons, students learned that the digit on the left of a twodigit number tells the number of tens and the digit on the right tells the number of ones.
In this lesson, students interpret three different baseten representations: baseten diagrams, _____ tens _____ ones, and addition expressions that represent the value of each digit. This is the first time students see expressions representing twodigit 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 twodigit numbers, but continue to make sense of how to read and say them based on their baseten structure. The teacher should record twodigit numbers when students say them.
 Engagement
 MLR7
Activity 1: Compare Representations of a Collection
Learning Goals
Teacher Facing
 Interpret different baseten representations of twodigit numbers (drawings, words, and addition expressions).
Student Facing
 Let’s think about how twodigit 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
Addressing
Lesson Timeline
Warmup  10 min 
Activity 1  10 min 
Activity 2  15 min 
Activity 3  15 min 
Lesson Synthesis  10 min 
Cooldown  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?
Print Formatted Materials
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