Unit 5, Lesson 9
Compare Numbers on the Number Line
Grade 2
Preparation
Lesson Purpose
The purpose of this lesson is for students to compare three-digit numbers using a number line.
Lesson Narrative
In previous lessons, students estimated the location of numbers on the number line within 100 and learned to locate numbers within 1,000 on the number line. In this lesson, students use the relative position of numbers on the number line to compare three-digit numbers. Students estimate the location of numbers on the number line and consider how the linear representation can help them compare numbers and explain their reasoning (MP3). Throughout the lesson, listen for the ways students make connections to place value as they estimate the location of numbers and compare numbers using the number line.
- Representation
- MLR8
- Compare and contrast (orally) representations used to compare 2 three-digit numbers, including base-ten diagrams and number line diagrams.
- Explain (orally) strategies for comparing three-digit numbers and express comparisons using <, >, and =.
- Let’s compare numbers on the number line.
Required Preparation
Activity 1
- Create a poster with a number line that shows 317 and 371 labeled.
Number line. Scale 300 to 400 by tens. 11 evenly spaced tick marks. First tick mark, 300. Last tick mark, 400. Point plotted between 310 and 320, labeled 317. Point plotted between 370 and 380, labeled 371.
Teacher Reflection Questions
Unlike talking, listening is a difficult thing to observe. At what points in the lesson did you observe students listening to one another’s ideas today in class? What indicators do you have that they were listening?
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