Title: The Greedy TriangleAuthor: Marilyn Burns
Illustrator: Gordon Silveria
Recommended Grade Level: K-3
Common Core Mathematics Standards Addressed: Geometry, reason with shapes and their attributes, problem solving.
Summary: This story is about a triangle who isn't happy with his current shape and wants to be a different shape. In the story, the triangle goes to the shapeshifter and makes his first request of adding one more side and one more angle, which turned him into a quadrilateral. As the story continues the triangle is changed to many different shapes.
Rating: ***** I highly recommend this book because it explains how geometry works. It allows students to connect the meanings of shapes by showing examples of how each shape looks in the real world.
Classroom ideas: This book could be used to introduce geometric shapes. Students could use shapes in the classroom to identify some of the shapes from the book. Students could cut out a triangle and then cut out other angles to add to the triangle to form different geometric shapes. You could also ask the students to describe their favorite shape and explain how many sides their shape has and what would their shape turn into if another angle and side were added to it.
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