First Grade Geometry


Recognize shapes based on attributes, compose single and composite shapes and partition shapes. Just click on the blue links to display or print pdfs. 

Standards 
Practice
Pages


Reason with shapes and their attributes  Cluster 1.  
Standard 1.G.1: Distinguish between deﬁning attributes (e.g., triangles are closed and threesided) versus nondeﬁning attributes (e.g., color, orientation, overall size) ; build and draw shapes to possess deﬁning attributes.  Attributes of Triangles Answers 1.G.1.a 
Attributes of Circles Answers 1.G.1.b 
Standard 1.G.2: Compose
twodimensional shapes (rectangles, squares, trapezoids, triangles, halfcircles, and quartercircles) or threedimensional 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. 
SquareTriangle Composite Answers 1.G.2.a 
TrapezoidHalf Circle Composite Answers 1.G.2.b 
Standard 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.  Circle Partitions Answers 1.G..3.a 
Describing and Comparing Partitions Answers 1.G.3.b 