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Mathematics - Common Core Standards

First Grade

Geometry

Reason with Shapes and Their Attributes

  • 1.G.1. Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size) ; build and draw shapes to possess defining attributes.
Triangle Attributes Attributes of Triangles Triangle Attributes  
Find the Rectangles Circle Attributes  








  • 1.G.2. Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles) or three-dimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders) to create a composite shape, and compose new shapes from the composite shape.
Make a Circle Composite Shapes - Rectangle    
       
  • 1.G.3. Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of. Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.
Divide Rectangles Into Halves Quarters of A Rectangle Squares Divided into Triangles Halves of Squares
Divide Circles Into Halves Divide Circles Into Quarters    
Color Half of the Shapes Halves of Shapes Find Quarters Quarters
Color Half of the Shapes Halves of Shapes Halves of Toys  
Cut Shapes into Quarters Quarters of Food Halves of Objects Halves of Food
       

The Common Core State Standards are © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved. For more information about the Common Core State Standards, visit their website at http://www.corestandards.org

Math Worksheets

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The Common Core State Standards are © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved. For more information about the Common Core State Standards, visit their website at http://www.corestandards.org