## Reflection: Rigor Filling Shadows With More and Less - Section 3: Center Time

While students were working on the Fill The Shadow WIth More or Less activity, I was circulating amongst the students.  I wanted to see how easily they could recognize what shapes would fill in the image, if they could use combinations of blocks to change their designs, and if they could decompose a shape into smaller shapes (CCSS.Math.Content.1.G.A.2).  I was also checking in on the use of the vocabulary and why the students chose the shapes they did.

If you look at the video clip titled Digging For the Reason, you will notice that the student said that she chose all green triangles because green was "cool."However, as I persisted with my questioning, I was able to get her mathematical reason for choosing the triangles when trying to use more blocks. This is why you need to continue to probe  students after initial response.  She had the knowledge and used a great approach but accepting that green was "cool" would have nto allowed for her knowledge to shine.

In the second video, Explanation and Vocabulary, the student clearly states why he chose the blocks he did and exhibits an understanding of decomposing shapes.

The third video, titled Matthew's Reasoning, is an example of a child who had a very advanced understanding of the task.  It would have been easy to quickly check in and assume that he had everything in hand.  However, listening to his explanation, he referred to the use of a rhombus, when in fact he was using trapezoids.  I asked him about this (after filming) and he did have a confusion on the vocabulary.  It reminded me the importance of not assuming and checking in with each child. There is also an example of his recording sheet in the section resource.

Rigor: Reflection on Center Time Conversations

# Filling Shadows With More and Less

Unit 9: Shapes Within Shapes
Lesson 5 of 10

## Objective: SWBAT alter their designs to use more or less pattern blocks to cover the same area.

### Thomas Young

203 Lessons14 new

## Big Idea: Putting It Altogether! That is the hope today as students use their understanding of composing and decomposing shapes to cover a given area. Today's lesson is bringing together many of the geometric skills from previous lessons.

Print Lesson
Add this lesson to your favorites
Standards:
Subject(s):
Math, Geometry, One-Dimensional Geometry, More/Less, 1st Grade, decomposing, Geometric Vocabulary
70 minutes

### Thomas Young

203 Lessons | 14 new

##### Similar Lessons

###### Combine 3D Shapes
1st Grade Math » Geometry
Big Idea: Bob The Builder look out! In this lesson, students will learn how to compose a new shape by combining 3D shapes.
Favorites(6)
Resources(14)
Lakeland, FL
Environment: Urban

###### More Ways Than One
1st Grade Math » Shapes and Blocks
Big Idea: Students explore ways they can make a given shape using a different number of pattern blocks. Students push their number sense with the challenge: Can you do it with more shapes?
Favorites(4)
Resources(12)
New Orleans, LA
Environment: Urban

###### Making new shapes with shapes
1st Grade Math » Understanding Shapes
Big Idea: My first graders have been studying the defining attributes of 2D shapes. They are going to love using toothpicks and marshmallows to present their knowledge of 2D and create 3D shapes.
Favorites(8)
Resources(16)
Oklahoma City, OK
Environment: Urban
sign up or
Something went wrong. See details for more info
 Nothing to upload details close