Unit 5, Lesson 5
Expanded Form of Numbers
Grade 2
Preparation
Lesson Narrative
In previous lessons, students represented three-digit numbers by recording how many of each unit (for example, 357 as 3 hundreds, 5 tens, 7 ones). They also connected representations of a number using the fewest number of base-ten blocks to the value of the digits in three-digit numbers.
In this lesson, students extend their understanding of ways to express the value of the digits in three-digit numbers to include expanded form. They represent three-digit numbers as the sum of the values of their digits (for example, ).
- Action and Expression
- MLR8
- Comprehend (in written and spoken language) the meaning of “expanded form.”
- Use three-digit numbers and expanded form to represent the same base-ten diagram and describe (orally) how they represent the same value.
- Let’s represent 3-digit numbers as a sum of the value of each digit.
Required Preparation
- Each group of 2 needs 3 number cubes.
Teacher Reflection Questions
As students represented numbers in expanded form and as three-digit numbers, what evidence did you see that they understand place value?