Sarah Lombardi Math Read aloud

The Greedy TriangleWritten By: Mariyln Burns Illustrated By: Gordon Silvaria

Topic: Geometry and read aloud

Grade: 2nd

Standards: CCSS.Math.Content.2.G.A.1 Recognize and draw shapes having specified

attributes, such as a given number of angles or a given number of equal faces.1 Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.

CCSS.ELA-Literacy.RL.2.7 Use information gained from the illustrations and words in a print or digital text to demonstrate understanding of its characters, setting, or plot

Objective: Students will be able to manipulate pretzel sticks to construct geometric shapes.

Students will recall names of geometric shapes and recite number of sides, angles and vertices.

Students will be able to identify examples of geometric shapes in a real world setting.

Materials The Greedy Triangle

2 bags small pretzel sticks

Napkins or work mats

Cups or bowls to hold pretzels

Procedure:

Introduction- Show students the cover of the book-

o What do you see on the cover of this book? Do you recognize any of the shapes on the cover?

Build prior knowledge- o I’m so happy that you were able to name some of the shapes on the cover

of this book! What can you tell me about the triangle on the cover? How many sides, angles and vertices does he have?

Create interest/engagement- o Today we are going to learn about some shapes that you already know and

look at some new shapes that you might not be familiar with. When you see a shape in the book that is new to you, I want you to pay attention to its name, number of sides, number of angles and number of vertices.

o One thing that is very special about this book is that you are going to be a part of the story. In this book the greedy triangle is not very happy with his shape and visits a shapeshifter to change it. You will all be playing the part of the shape shifter. As we read through the story you will be changing the greedy triangle’s shape.

Introduce activity and manipulative- o Give each child 10 pretzel sticks in a cup.o Make sure each child has a napkin or work mat to cover the desk.o Instruct children to refrain from eating pretzels until after the lesson.

During reading-o Stop each time the greedy triangle changes shape and allow kids to

manipulate the pretzel sticks. o How many sides/ angles does the greedy triangle have now? o Give students more time as shapes become more difficult to make.o Students can work with the person next to them if they need help.

After reading- o Give each student a shape chart.o Fill in name of shape, number of sides, number of vertices and number of

angles as a class (if students understand first few examples allow them to work on their own).

o Allow students to work with the person next to them to complete examples of geometric shapes.

Differentiation:

Special education students-o Students with disabilities can be provided with a list of geometric shapes

with names and pictures. This will help students who are visual learners, and will aid in the construction of shapes during the read aloud.

o Students with physical disabilities can use a larger manipulatives such as pretzel rods.

o Students who cannot fill in the chart with the class may be provided with a chart that is partially completed.

Gifted/talented students-o Gifted students and early finishers can be challenged to find examples

difficult shapes in the real world. These shapes might include heptagons, octagons, nonagons and decagons.

o These students can use the Internet as a resource to complete this challenge.

Assessment:

Informal assessment- o Students will be able to create geometric shapes with pretzel sticks. o Students will participate in class completion of shape chart.

Formal assessment- o Students will be able to accurately complete shapes chart.

Square

Diamond

Triangle

Trapezoid

Pentagon

Make pretzel shapes here

Hexagon