Prekindergarten: Unit PK.G.A.1-2, Identify and Describe Two-Dimensional Shapes (circles, triangles, rectangles; including a square which is a special rectangle)

Enduring Understandings:

1. Geometry and spatial sense offer ways to interpret and reflect on our physical environment.
2. Analyzing geometric relationships develops reasoning and justification skills.
3. If I join shapes, I can create new shapes.

Essential Questions:

1. How do geometric models describe spatial relationships?
2. How are geometric shapes and objects classified?
3. Where in the real world can I find three-dimensional shapes?
4. How can objects be represented and compared using geometric attributes?
5. How can I put two-dimensional shapes together and take them apart to form other two-dimensional shapes?



Standards Addressed in This Lesson:It is critical that the Standards for Mathematical Practice are incorporated in ALL lesson activities throughout the unit as appropriate. It is not the expectation that all eight Mathematical Practice will be evident in every lesson. The Standards for Mathematical Practice make an excellent framework on which to plan your instruction. Look for the infusion of the Mathematical Practices throughout this unit.


1. PK.G.A.1 Match like (congruent and similar) shapes.
2. PK.G.A.1 Group the shapes by attributes.



Lesson Topic:Exploration of Shapes.


Relevance/Connections:


1. PK.CC.4: Understand the relationship between numbers and quantities to 5, then 10; connect counting of cardinality.
2. PK.MD.1: Describe measurable attributes of objects.
3. PK.MD.2: Directly compare 2 objects with a measurable attribute in common.
4. PK.MD.3: Sort objects into self-selected and given categories



Student Outcomes:


The student will:

1. Match similar two-dimensional shapes.
2. Sort shapes by attributes
3. Explain their “grouping” rule.
4. Distinguish between examples and non-examples of various shapes.

1. Sorts and classifies objects by color and size
2. Compares objects in shape and size
3. Combines and separates shapes to make other shapes

Method for determining student readiness for the lesson:

All students will participate. Lesson activities can be differentiated based on students’ understanding of two-dimensional shapes.

Learning Experience