Unit Length and Description:
4 weeks
This unit focuses on
reasoning about shapes and their attributes.
Students will build and draw shapes that possess certain attributes.
Students will engage in activities that compose and decompose plane and solid
figures. Students will recognize
shapes from different perspectives and orientations. Fractions, as equal shares, will be
introduced in this unit.

Standards:
CCSS for Mathematical Content

CCSS#

CCSS Text

Geometry

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.

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. (Note: Students do not need to learn
the formal names such as right rectangular prisms.)

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.

Standards for
Mathematical Practice (MP)

MP.1

Make sense of problems and persevere in solving them.

MP.2

Reason abstractly and quantitatively.

MP.3

Construct viable arguments and critique the reasoning of
others.

MP.4

Model with mathematics.

MP.6

Attend to precision.

MP.7

Look for and make use of structure.

Standards: Instructional Outcomes
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.
 I
can identify attributes that make a shape.
 I
can identify attributes that do not make the shape.
 I
can classify shapes by their attributes.
 I
can build shapes to show attributes.
 I
can draw shapes to show attributes.
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. (Note:
Students do not need to learn the formal names such as right rectangular
prisms.)
 I
can recognize that shapes can be composed and decomposed to make new
shapes.
 I
can describe attributes of original and composite shapes (combined
shapes).
 I
can determine how the original and created composite shapes (combined
shapes) are alike and different.
 I
can create composite shapes
 I
can compose new shapes from a composite shape.
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.
 I
can identify when shares (parts) are equal.
 I
can identify two and four equal shares (parts).
 I
can describe equal shares (parts) using vocabulary; halves, fourths,
and quarters, half of, fourth of, and quarter of.
 I
can describe the whole as two of two or four of four equal shares
(parts).
 I
can justify why dividing (decomposing) a circle or rectangle into more
equal shares (parts) creates smaller pieces.


Enduring Understandings:
·
I
can identify twodimensional and threedimensional shapes based on defining
attributes of the shape.
·
I
can use twodimensional and threedimensional shapes to compose new
shapes.
·
I
can decompose twodimensional and threedimensional shapes to create new
shapes.

Essential Questions:
·
How can I tell about shapes?
·
Where can shapes be found in my world?
·
How can I sort and tell about shapes?
·
How are shapes alike? Different?
·
How can I use twodimensional and
threedimensional shapes to compose new shapes?
