Lesson 5
Order Numbers 120 (optional)
Lesson Purpose
Lesson Narrative
In a previous lesson, students initially counted out objects and added or subtracted one object to determine one more or one less than a given number. In this lesson, students continue working on identifying one more and one less than a given number up to 20 without objects and relating one more and one less to the count sequence (MP8). This lesson is optional because the standards do not require students to compare groups of objects or written numbers beyond 10.
If students need additional support with the concepts in this lesson, refer back to Unit 6, Section B in the curriculum materials.
 Engagement
 MLR8
Learning Goals
Teacher Facing
 Order numbers 120.
 Use knowledge of the count sequence to add and subtract 1 and determine one more and one less.
Student Facing
 Let’s think about the order of numbers 120.
Required Materials
Materials to Gather
Materials to Copy
 Number Clues
 Number Cards 120
Required Preparation
Activity 1:
 Create a set of cards from the blackline master for each group of 4.
Activity 2:
 Each group of 2 needs one card from the blackline master.
 Display large numbers 1 to 20 around the room. The numbers may be displayed in order, or the sequence of numbers can be mixed up for more of a challenge.
Activity 3:
 Gather materials from:
 Less, Same, More
 Math Fingers
 Tower Build
 Math Stories
 Which One
Lesson Timeline
Warmup  10 min 
Activity 1  10 min 
Activity 2  15 min 
Activity 3  20 min 
Lesson Synthesis  10 min 
Cooldown  0 min 
Teacher Reflection Questions
Print Formatted Materials
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Additional Resources
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