Unit 6, Lesson 8
Are All Pieces Created Equal?
Grade 2
Preparation
Lesson Narrative
In previous lessons, students learned that when they partition circles and rectangles into halves, thirds, or fourths, each piece must be equal. To this point, they have determined whether the pieces are equal by cutting out pieces and physically matching them and by visually inspecting whether the pieces appear to be the same equal-size shapes.
In this lesson, students learn that halves, thirds, and fourths of the same whole can be different shapes or have different attributes. For example, they recognize that a square is partitioned into fourths, whether it is partitioned into equal-size triangles or equal-size squares.
By the end of the lesson, students realize that as long as the shapes are partitioned into the same number of equal pieces, the pieces will have the same name and the same size.
- Representation
- MLR2
- Draw and describe (orally) circles and rectangles that are partitioned into “halves,” “thirds,” and “fourths.”
- Generalize (orally) that equal-size pieces of the same whole can look different but remain the same size and have the same name.
- Let’s make halves, thirds, and fourths in different ways.
Required Preparation
None
Teacher Reflection Questions
What did you say, do, or ask during the Lesson Synthesis that helped students be clear on the learning of the day? How did previewing the Cool-down of the lesson before you started teaching today allow you to help students synthesize their learning?