Unit 8, Lesson 1
Can You Share?
Grade 2
Preparation
Lesson Narrative
In this lesson, students learn that some numbers of objects can be split into 2 equal groups without any objects left over, and other numbers cannot. The work of this lesson builds on students’ real-world experiences with equal sharing and prepares them to understand and use the terms “even” and “odd” to describe groups of objects in future lessons (MP6).
In the first activity, students separate objects into 2 equal groups and begin to create a list of numbers that can be split into 2 equal groups. In the second activity, students are given access to objects, but are also encouraged to consider other representations of numbers, including equations, that may show a number of objects as 2 equal groups or 2 equal groups and 1 leftover.
Students should have access to objects (connecting cubes or counters) throughout the lesson, including the Cool-down.
- Action and Expression
None
- Determine whether a collection of objects can be arranged into 2 equal groups with “some leftovers” or “no leftovers” and describe (orally) observations about each category.
- Let’s equally share groups of objects.
Required Preparation
- Each group of 2 needs a container of counters with 4 to 15 counters in each container. These containers will be used again in the next lesson.
- Create a t-chart on a large piece of chart paper to display in the Activity Synthesis. Title it “Two Equal Groups,” and label the columns “no leftovers” and “some leftovers.”
Teacher Reflection Questions
What ideas did students already have about the number of objects that can be made into equal groups? How did you elicit and use these ideas during the lesson?