If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.
You already know Dokkio is an AI-powered assistant to organize & manage your digital files & messages. Very soon, Dokkio will support Outlook as well as One Drive. Check it out today!

2-GM-1-2

Page history last edited by Tashe Harris 6 years, 2 months ago

2.GM.1.2 Describe, compare, and classify two-dimensional figures according to their geometric attributes.

In a Nutshell

Students enter second grade with a basic knowledge of shapes. Second graders build on this knowledge by describing shapes according to their attributes, such as sides, angles, and vertices. In third grade, students will sort three-dimensional shapes based on attributes.

Student Actions	Teacher Actions
Communicate mathematically by justifying their thinking and explaining two-dimensional shapes according to geometric attributes. Develop accurate and appropriate procedural fluency of sorting shapes into groups with one or more different attributes and justifying their placements. Make conjectures and solve problems about shapes while working in groups .	Pose purposeful questions that provide opportunities for students to describe the attributes of shapes found in the real world. Use and connect mathematical representations by focusing students on the attributes of various shapes, such as a pentagon is a polygon with 5 sides. Implement tasks that promote reasoning and problem solving using both examples and nonexamples of two-dimensional shapes.
Key Understandings	Misconceptions
Two-dimensional geometric shapes can be analyzed by their characteristics and properties. Sides and vertices are attributes of two-dimensional shapes.	Squares are not rectangles. A change in orientation changes the shape. A square is only a square if its base is horizontal. All triangles sit on a side, i.e. they don't recognize ▷ as a triangle. The only triangle is an equilateral triangle. Shapes have only one label. Not realizing, for example, a square is a parallelogram, a rectangle, and also a rhombus.