The purpose of this lesson is for students to represent a two-digit number in more than one way, using tens and ones.
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 two-digit number. They interpreted, used, and connected different base-ten representations for two-digit numbers including connecting cubes in towers of 10 and singles, base-ten diagrams, addition expressions, and written numbers.
In this lesson, students represent two-digit numbers in more than one way based on place value. Students learn that there are different ways to represent a two-digit 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
- Understand that a two-digit number can be represented in different ways using tens and ones.
- Let’s make two-digit numbers with tens and ones in different ways.
- Each group of 3-4 needs a bag of connecting cubes in 5 towers of 10 and 4 or 5 handfuls of singles.
- Gather materials from previous centers:
- Greatest of Them All, Stage 1
- Get Your Numbers in Order, Stage 1
- Grab and Count, Stage 2
|Activity 1||15 min|
|Activity 2||10 min|
|Activity 3||15 min|
|Lesson Synthesis||10 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
For access, consult one of our IM Certified Partners.