Grade 1: Chapter 12 – Two-Dimensional GeometryChapter Essential Question: How do you sort and describe two-dimensional shapes?

Before(Kindergarten)

Chapter Twelve Standards Grade One

After (Grade Two)

Identify and describe shapes (squares, circles, triangles, rectangles, hexagons, cubes, cones, cylinders and spheres). K.G.2, K.G.3

Analyze, compare, create and compose shapes. K.G.4, K.G.6

Geometry 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.

I can use defining attributes to sort shapes. I can describe attributes of two-dimensional shapes.

Reason with shapes and their attributes. 2.G.1, 2.G.2, 2.G.3

Geometry 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.

I can use objects to compose new two-dimensional shapes. I can compose a new shape by combining two-dimensional shapes. I can make new shapes from composite two-dimensional shapes using the strategy act it out. I can decompose combined shapes into shapes. I can decompose two-dimensional shapes into parts.

Geometry 3: Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths and quarters, and use the phrases half of, fourth of, and quarter of. Describe the whole as two of, four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.

I can identify equal and unequal parts (or shares) in two-dimensional shapes. I can partition circles and rectangles into two equal shares. I can partition circles and rectangles into four equal shares.

Des Moines Public Schools 2014-2015 Math Curriculum Guides Page | 1Grade 1 – Chapter 12

Grade 1: Chapter 12 – Two-Dimensional GeometryChapter Essential Question: How do you sort and describe two-dimensional shapes?

Each day the math block will begin with 15 minutes of Daily Math Review and Mental Math. The focus of DMR should be either prerequisite standard skills or previous chapter concepts that were not mastered. The focus of mental math should be based on the current Chapter’s skills and concepts. Adjust the amount of questions in DMR and MM to fit into the 15 minute time block.

Suggested Chapter PacingAll lessons are paced for one day, unless otherwise indicated. Teachers may adjust to meet students’ needs.

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Pre-Assessment

Review Prerequisite SkillsFind the Shape: TE 667IShape Pictures TE 667I

Show What You Know AssessmentTE 668

Identify Tier 2 and Tier 3 Groups for Small Group Instruction.

Day Before Lesson 12.1

Vocabulary Activity Define and describe Chapter Twelve

vocabulary words. TE 669

Vocabulary BuilderGuess the Word TE 670A

Identify students who will need further vocabulary support for Chapter Twelve.

Preview Chapter CentersIntroduce chapter games, activities, and literature

students will be using during center time.

School – Home LetterRead together and send

home.

I Can Statement Essential Question Implementation Notes

Lesson 12.1Geometry 1

I can use defining attributes to sort shapes. How can you use attributes to sort two-

dimensional shapes?

Introduce Activity: More Alike Than Not Introduce Literature: Signs Shape Up Introduce Game: On the Water

Lesson 12.2Geometry 1

I can describe attributes of two-dimensional shapes.

What attributes can you use to describe two-dimensional shapes?

2D Shapes Glue Pattern Blocks Red and Blue Crayons Introduce Activity: On the Corner

Lesson 12.3Geometry 2

I can use objects to compose new two-dimensional shapes.

How can you put two-dimensional shapes together to make new two-dimensional

shapes?

Pattern Blocks Introduce Activity: Building Blocks

Lesson 12.4Geometry 2

I can compose a new shape by combining two-dimensional shapes. How can you combine two-dimensional

shapes to make new shapes?

2D Shapes

Lesson 12.5Geometry 2

I can make new shapes from composite two-dimensional shapes

using the strategy act it out.

How can acting it out help you make new shapes from combined shapes?

2D Shapes (see eTeachers resouces) Tape Mid-Chapter Checkpoint is option TE 698

Lesson 12.6Geometry 2

I can decompose combined shapes into shapes.

How can you find shapes in other shapes? Pattern Blocks This lesson may take up to 2 days

Lesson 12.7Geometry 2

I can decompose two-dimensional shapes into parts.

How can you take apart two-dimensional shapes?

Orange & purple crayons

Lesson 12.8Geometry 3

I can identify equal and unequal parts (or shares) in two-dimensional

shapes.

How can you identify equal and unequal parts in two-dimensional shapes?

Introduce Activity: Half Math

Lesson 12.9Geometry 3

I can partition circles and rectangles into two equal shares.

How can a shape be separated into two equal shares?

Lesson 12.10Geometry 3

I can partition circles and rectangles into four equal shares.

How can a shape be separated into four equal shapes?

Des Moines Public Schools 2014-2015 Math Curriculum Guides Page | 2Grade 1 – Chapter 12

Grade 1: Chapter 12 – Two-Dimensional GeometryChapter Essential Question: How do you sort and describe two-dimensional shapes?

Resources and Centers for Chapter 12Technology Hands-On Resources Centers

Digital Lesson: Engage 2D Shapes Activity: More Alike Than NotInteractive White Board Lesson Crayons Activity: Half MathInteractive Student Edition Math Journal Activity: On the CorneriTools: Fractions MathBoard Activity: Building BlocksiTools: Geometry Other Hands-On Resources may be needed for Small Group Instruction

Activities.Literature: Signs Shape Up

Math on the Spot Videos Game: On the WaterMega MathPersonal Math Trainer

Additional Resources for Chapter 12Geometry 1 Geometry 2 Geometry 3

Amazing Attributes Building Shapes Teachers will use Go Math materials to teach this standard. If more practice is needed teams of teachers may find or create more experiences with this concept.

Attribute Blocks What’s So Special About Triangles, Anyway?

Independent Practice

Properties Everywhere:

Des Moines Public Schools 2014-2015 Math Curriculum Guides Page | 3Grade 1 – Chapter 12