Download Grade 2 Unit of Study B Family Letter ENGLISH

Grade 2 Important Math Information
Geometry
Dear Family,
Our class is starting a new unit of study in mathematics called Geometry.
This unit of study focuses on 2-D and 3-D shapes and rectangular arrays. We will also work on
addition doubles facts and subtraction plus 1, plus 2, and make 10 facts.
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: Recognize and draw 2-D and 3-D shapes.
Example Problems
Example Student Solutions
Hexagon
Draw a hexagon,
triangle, rectangle, and
pentagon.
Triangle
3 sides
6 sides
Rectangle
Tell how many sides
each shape has.
Pentagon
4 sides
5 sides
“3-D shapes are solids. To
draw the shape, I am picturing
dice. All of the faces of a die
are squares.”
Draw a 3-D shape that
has 6 faces. Each face
is a square.
“The math name for the shape
is a cube.”
What is the name of
the shape?
This is a cube.
“
CCPS Elementary Mathematics
Learning Goal: Partition a rectangle into rows and columns of squares and be able to count to
find the total number of squares.
Example Problem
Example Student Solution
Make a rectangle from
8 squares.
Describe your
rectangle.
My rectangle has 2 rows of squares and
4 columns of squares. It was made from
8 squares.
Learning Goal: Use addition to find the total number of objects arranged in an array and be
able to write an equation to represent the repeated addition.
Example Problem
Example Student Solutions
How many cans of
juice are in the array?
Write an equation to
show how you can find
the total.
There are 3 rows of juice,
each row has 4 cans of juice.
4 + 4 + 4 = 12 cans of juice
CCPS Elementary Mathematics
Learning Goal: Fluently add doubles combinations and be able to fluently subtract related
plus 1, plus 2, and make 10 combinations.
Example Problems
Example Student Solutions
Doubles Addition:
8+8=
9+9=
Related Plus 1 Subtraction:
7–1=
7–6=
Related Plus 2 Subtraction:
6–2=
6–4=
8 + 8 = 16
9 + 9 = 18
7–1=6
7–6=1
“I know that 6 + 1 = 7. I can use this fact to
solve 7 - 1 and 7 – 6.”
6–2=4
6–4=2
“I know that 4 + 2 = 6. I can use this fact to
solve 6 - 2 and 6 - 4.”
Make 10 Subtraction:
10 – 4 =
10 – 6 =
“I have been practicing doubles facts for a
long time. These are facts I now just know.”
10 – 4 = 6
10 – 6 = 4
“It’s easy to subtract numbers from 10. I
just think about what two numbers
together make 10. Since 4 + 6 make 10,
then 10 – 4 = 6 and 10 – 6 = 4”
Mathematical Thinking and Practices Learning Goal: Use numbers and symbols
to represent situations and understand how the numbers and symbols relate to
the situations.
Things you can do at home to support your student throughout this
unit of study:
 Making Shapes Make shape pictures out of shapes cut from paper. Cut a
variety of shapes (for example, squares, rectangles, triangles, circles, and
hexagons) for your child to glue onto a background. You might like to do this as a family
mural, adding shapes over a period of time to create a scene. Shapes can be combined.
Markers and/or crayons can be used to add details.
 Math and Literature Here are some children’s books that contain ideas related to our work
in this geometry unit of study. You can find many of them in your local public library.
o Burns, Marilyn. The Greedy Triangle
o Friedman, Aileen. A Cloak for the Dreamer
o Hoban, Tana. Shapes, Shapes, Shapes
o Greene, Rhonda Gowler. When a Line Bends . . . A Shape Begins
CCPS Elementary Mathematics
o Pluckrose, Henry. Math Counts: Shapes
o Schulz, Charles M. How to Draw Peanuts
CCPS Elementary Mathematics