## Reflection: Developing a Conceptual Understanding Comparing Three Digit Numbers - Section 5: Closing

Throughout this lesson students are asked to justify their thinking by explaining WHY one number is greater than another.  It is important that students explain their thinking to not only build their own conceptual understanding but also to help their peers more deeply understand the concepts.  In the video attached to the closing section of this lesson, you can see a student struggling to explain exactly why one number is greater than the other.  This process of putting her mathematical thinking into words helps her to create a firmer understanding of the concept of comparing numbers and gives me, as the teacher, a clear view of my students' strengths and areas for growth in terms of objective mastery.

Student Explanations
Developing a Conceptual Understanding: Student Explanations

# Comparing Three Digit Numbers

Unit 1: Comparing Numbers
Lesson 1 of 4

## Big Idea: Students use their knowledge of place value to compare three digit numbers.

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45 minutes

### Caitlin Vaughan

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