Lesson 12
Order Numbers
Lesson Purpose
Lesson Narrative
In previous lessons, students learned to compare threedigit numbers using the value of each digit. They have used the number line and baseten diagrams to compare numbers and explain their thinking.
The purpose of this lesson is for students to compare threedigit numbers and place them in order from least to greatest and from greatest to least. Throughout the lesson, students are encouraged to use their understanding of place value to reason about the correct order of a set of numbers. They also use the number line as a tool for sequencing numbers and visualizing the relative distance between numbers. The work of this lesson helps students consolidate their understanding of the counting sequence, the baseten structure of numbers, and the relative position of numbers on the number line. These understandings will be helpful as students add and subtract within 1,000 in future lessons.
 Representation
 MLR8
Learning Goals
Teacher Facing
 Order threedigit numbers using place value understanding and the relative position of numbers on a number line.
Student Facing
 Let’s put numbers in order.
Required Preparation
Lesson Timeline
Warmup  10 min 
Activity 1  15 min 
Activity 2  20 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
Suggested Centers
 Mystery Number (1–4), Stage 2: Threedigit Numbers (Addressing)
 Greatest of Them All (1–5), Stage 2: Threedigit Numbers (Addressing)
 Get Your Numbers in Order (1–5), Stage 1: Twodigit Numbers (Supporting)
 Jump the Line (2–5), Stage 1: Add and Subtract within 100 (Supporting)
Print Formatted Materials
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Additional Resources
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