Title: The
Greedy Triangle
Author: Marilyn
Burns
Illustrator:
Gordon Silveria
Recommended
Grade level: Pre-K-4th
Posted By: Jennifer Colon
Common Core
Standards:
CC.SS. MATH.CONTENT.K.G.4. Analyze and compare two- and
three-dimensional shapes, in different sizes and orientations, using informal language
to describe their similarities, differences, parts (e.g., number of sides and
vertices/“corners”) and other attributes (e.g., having sides of equal length).
CC.SS. MATH.CONTENT.K.G.5. Model shapes in the world by building
shapes from components (e.g., sticks and clay balls) and drawing shapes.
CC.SS. MATH.CONTENT.K.G.6. Compose simple shapes to form larger
shapes. For example, “Can you join these two triangles with full sides
touching to make a rectangle?”
CC.SS. MATH.CONTENT.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.
CC.SS. MATH.CONTENT.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.
CC.SS. MATH.CONTENT.2.G.1. Recognize and draw shapes having
specified attributes, such as a given number of angles or a given number of
equal faces. Identify triangles, quadrilaterals, pentagons, hexagons, and
cubes.
Summary:
This book is
about a triangle that is dissatisfied with his life. He is tired of being a
boring triangle and goes to the local shape shifter. The local shape shifter is
able to help the triangle by adding another angle and poof he becomes a
quadrilateral. The triangle however, becomes greedy and is unsatisfied and keeps
asking to change shape after shape. By the end of the book we learn many
different shapes and where we can find them in the world as well as learn on
character.
I gave this book a five rating because it is a
fun way in which to introduce polygons and different kinds of shapes. I also
like that the book can be used across any grade in elementary school depending
on the target of your lesson plan. The book is a great way for students to make
real world connections by having them search for shapes in their world and is
also a good way to build vocabulary in both literacy and math.
Classroom ideas:
Pre- School:
1.Make Photocopies of the pages of each shape and make each
shape a different group of kids. (If possible blow up the images to half poster
size to make images clearer). Give students black markers and ask them to
search for their shape and trace it with the black marker.
2. Have students look through a magazine and find objects of
different shapes.
First Grade or Second Grade:
1.Give students geometric shapes and geometric boards. Let them
explore the shapes freely for a few minutes. Ask students to share their
noticing’s about the shapes. Ask students to now try to use shapes to build
different shapes. Again ask them to share their noticing’s.
2.Have students respond to a prompt such as “If I could be a
shape I would be a triangle because…” (Students have to describe their shape
and name different places they would be found in their world if they were to be
that shape.
Third grade:
Have students go on a Shape Hunt around the school or around the
neighborhood. Give them clipboards in which they can record where they find a
shape and draw it. It could also be fun to use I-pads or cameras in order for
the kids to take pictures of some of the shapes they find.



