Grade 1 Important Math Information
2-D Geometry
Dear Family,
Our class is starting a new unit of study in mathematics called 2-D Geometry. This geometry
unit of study focuses on two-dimensional shapes and their relationships. Your student will
observe, describe, compare, classify, represent, and build with 2-D shapes. This will provide
the foundation to 3-D shapes, which we will study later on in the year. In this unit of study,
your student will use geometric language such as: attribute, circle, closed shape, hexagon,
rectangle, rhombus, sides, square, trapezoid, triangle, two-dimensional, and vertices. Your
student will learn how to put smaller shapes together to make a bigger shape and will fill a
bigger shape with smaller shapes. The specific learning goals your student will be working
toward are listed below with examples of student work showing understanding of each
learning goal.
Learning Goal: Identify, describe, build, and draw 2-D shapes.
Example Problem
Example Student Solution
Circle all triangles in
this group.
Then, write 2 things
that are the same
for all triangles.
Draw a shape that is
NOT a triangle.
What is the name of
that shape?
CCPS Elementary Mathematics
All triangles have closed shapes.
All triangles have 3 vertices.
This is a circle. It is not a triangle because
it doesn’t have 3 vertices.
Learning Goal: Make 2-D shapes from other 2-D shapes.
Example Problems
Example Student Solutions
Fill this shape with
as many blocks as
you can.
“I can fill this
shape with 18
triangles.”
Fill this shape with
as few blocks as you
can.
“I can fill this
shape with 3
hexagons.”
Mathematical Thinking and Practices Learning Goal: Work carefully, double-check,
and clearly explain my thinking.
Things you can do at home to support your student throughout this unit
of study:
• Ask what shapes can be found around your house.
• What shape is a window? What shape is a dish? How do you know that?
• What shape is a napkin? If I fold the napkin, do I get different shape?
How are the shapes different?
• Notice that floor tile is one shape placed together to create another shape. For
example, squares are placed together to create a large rectangle.
CCPS Elementary Mathematics