Unit 6, Lesson 4
Does the Number Change?
Kindergarten
Preparation
Lesson Purpose
The purpose of this lesson is for students to count collections of objects and understand that the number of objects in a collection stays the same, regardless of how they are arranged.
Lesson Narrative
Students count the same collection of objects in different arrangements to build this conservation of number, which develops through experience over time. While developing conservation of number, students may need to recount the objects each time they are rearranged. With repeated practice, some students may know that the number of objects is the same without recounting (MP8). The purpose of the Lesson Synthesis is to highlight that a collection of objects does not need to be counted when they are rearranged.
- Action and Expression
- MLR8
- Generalize (orally) that the number of objects in a group is unchanged when the objects are rearranged or counted in a different way.
- Let’s count objects after we move them.
Required Materials
Required Preparation
Activity 1
- Each student needs a collection of 11–20 objects.
Activity 2
- Each student needs a collection of 11–20 objects.
Activity 3
- Create a tower with 16 cubes for the Activity Synthesis.
- Gather materials from:
- Find the Pair, Stage 1
- Number Race, Stages 1 and 2
- Subtraction Towers, Stage 1
- 5-Frames, Stages 1 and 2
Suggested Centers
NoneTeacher Reflection Questions
As students worked together today, where did you see evidence of the mathematical community established over the course of the school year?
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