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 shape.
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 have the same size.
- Partition circles and rectangles into halves, thirds, and fourths in different ways.
- Recognize halves, thirds, and fourths of rectangles and circles.
- Let’s make halves, thirds, and fourths in different ways.
|Activity 1||20 min|
|Activity 2||15 min|
|Lesson Synthesis||10 min|
Teacher Reflection Questions
- How Are They the Same? (1–5), Stage 2: Grade 2 Shapes (Addressing)
- Which One? (K–5), Stage 3: Grade 2 Shapes (Addressing)
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