Lesson 19
Make Twodigit Numbers
Lesson Purpose
The purpose of this lesson is for students to represent a twodigit number in more than one way, using tens and ones.
Lesson Narrative
In a previous unit, students decomposed numbers to 20 in different ways. In previous lessons, students learned about the meaning of the digits in a twodigit number. They interpreted, used, and connected different baseten representations for twodigit numbers including connecting cubes in towers of 10 and singles, baseten diagrams, addition expressions, and written numbers.
In this lesson, students represent twodigit numbers in more than one way based on place value. Students learn that there are different ways to represent a twodigit number with tens and ones which will be important in a later unit when they compose a ten to add within 100.
 Action and Expression
 MLR7
Learning Goals
Teacher Facing
 Understand that a twodigit number can be represented in different ways using tens and ones.
Student Facing
 Let’s make twodigit numbers with tens and ones in different ways.
Required Materials
Materials to Gather
Required Preparation
Activity 1:
 Each group of 34 needs a bag of connecting cubes in 5 towers of 10 and 4 or 5 handfuls of singles.
Activity 3:
 Gather materials from previous centers:
 Greatest of Them All, Stage 1
 Get Your Numbers in Order, Stage 1
 Grab and Count, Stage 2
CCSS Standards
Lesson Timeline
Warmup  10 min 
Activity 1  15 min 
Activity 2  10 min 
Activity 3  15 min 
Lesson Synthesis  10 min 
Cooldown  0 min 
Teacher Reflection Questions
In the next unit, students add within 100, including adding numbers that require composing a new ten when adding by place. How will the work of this section prepare students for the upcoming work with addition?
Print Formatted Materials
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Additional Resources
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