## Reflection: Standards Alignment Comparing & Sorting Shapes - Section 2: Presentation of Lesson

This lesson is derived from what happened last year.  I used the terms two-dimensional and three-dimensional throughout the unit, but I did not do a lesson specifically focusing on that mathematical vocabulary.  On the unit test, I couldn't believe how many students were not able to identify a cylinder as a three-dimensional shape.  The confusion on their faces when I read the question combined with the number of students who answered the question incorrectly let me know that I had not be clear in my instruction.

This year, I decided to spend one whole lesson focusing on these terms and making sure that the students could sort the shapes into those two categories.  This is important because Common Core Standard K.G.3 says, "Identify shapes as two-dimensional (lying in a plane, “flat”) or three-dimensional (“solid”)." Sorting is an appropriately rigorous task to determine if students are "identifying" the shapes.

Using the Correct Terminology
Standards Alignment: Using the Correct Terminology

# Comparing & Sorting Shapes

Unit 4: Positions and Shapes
Lesson 6 of 17

## Big Idea: Two-dimensional shape and three-dimensional shapes are related! Students will use play dough to see how the two kinds of shapes are related. Students will also be able to differentiate between two-dimensional and three-dimensional shapes.

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8 teachers like this lesson
Standards:
Subject(s):
Math, Critical Area, Describing Shapes
55 minutes

### Christina Yingling-Smith

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