CCSS.Math.Content.1.G.A
The standard
Reason with shapes and their attributes.
Common Core State Standards for Mathematics
What this standard means
Students need to name, sort, build, and compare shapes by their parts. They should notice sides, corners, straight or curved edges, equal parts, and how shapes can be put together or taken apart to make new shapes.
Mastery looks like a student saying why a shape belongs in a group, not just naming it. They can explain that a square is a rectangle because it has four straight sides and square corners. Common trouble spots are sorting by color or size instead of attributes, calling any pointy shape a triangle, and thinking a turned shape is a different shape.
Ways to teach it
- Hands-on activity: Give pairs pattern blocks and ask them to build a hexagon three different ways, then trace each solution.
- Discussion prompt: Show a square, rectangle, and rhombus, then ask, “How are these alike, and how are they different?”
- Quick assessment: Hand students six mixed shapes and say, “Circle all shapes with four sides, then tell me how you know.”
- Real-world connection: Take a shape walk in the classroom and list objects that match circles, rectangles, triangles, and cubes.
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- CCSS.Math.Content.2.G.A
Reason with shapes and their attributes.
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Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces. Identify triangles, quadrilaterals, pe...
- CCSS.Math.Content.3.G.A
Reason with shapes and their attributes.
- CCSS.Math.Content.1.G.A.1
Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size); bu...