Lesson 10
Center Day 2 (optional)
Warmup: How Many Do You See: BaseTen Blocks (10 minutes)
Narrative
The purpose of this How Many Do You See is to build on what students know about place value to make 100 using tens and ones in groups of 25. The progression of the 4 images demonstrates counting by 25. This work will be important in upcoming lessons where students combine coins to make 100 cents or 1 dollar.
Launch
 Groups of 2
 “How many do you see? How do you see them?”
 Flash the image.
 30 seconds: quiet think time
Activity
 Display the image.
 “Discuss your thinking with your partner.”
 1 minute: partner discussion
 Record responses as an expression using hundreds, tens, and ones.
 Repeat for each image.
Student Facing
Student Response
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Activity Synthesis
 “Let’s say the value represented by the images in order.” (25, 50, 75, 100)
 “What pattern did you notice when combining the groups of the blocks and the value the blocks represent?” (When there were 2 groups of 25 it made a new ten with no ones left over, but when it was 3 groups of 25 there was a new ten and an extra 5.)
Activity 1: Introduce How Are They the Same? (15 minutes)
Narrative
The purpose of this activity is for students to learn stage 2 of the How Are They the Same? center. Students lay 6 shape cards face up. One student picks two cards that have an attribute in common. All students draw a shape that has a shared attribute with the two shapes. Students get a point if they draw a shape that no other student drew. It is possible that students will draw a shape with a different shared attribute than what the original student chose. This can be an interesting discussion for students to have.
Required Materials
Required Preparation
 Each group of 2 needs the shape cards used in previous lessons.
Launch
 Groups of 4
 Give each group a set of cards and access to scratch paper.
 “We are going to learn a new way to play the How Are They the Same center.”
 “You will lay 6 shape cards face up. One member of your group will pick two cards that have an attribute in common.”
 “Then, all members of the group will draw a shape that has a shared attribute with those two shapes. You get a point if you draw a shape that no other person in your group drew.”
 If needed, play a round with the class.
Activity
 10 minutes: partner work time
 Monitor for shared attributes that are more challenging for students to notice.
Activity Synthesis
 Display two shape cards.
 “What shared attributes do you notice about these two shapes? Draw a shape that also has that attribute.”
Activity 2: Centers: Choice Time (25 minutes)
Narrative
The purpose of this activity is for students to choose from activities that focus on working with shapes.
Students choose from any stage of previously introduced centers.
 How Are They the Same?
 Which One?
 Can You Draw It?
Required Materials
Materials to Gather
Required Preparation
Gather materials from:
 How Are They the Same?, Stage 2
 Which One?, Stage 3
 Can You Draw It?, Stage 2
Launch
 “Now you will choose from centers we have already learned. One of the choices is to continue with How Are They the Same.”
 Display the center choices in the student book.
 “Think about what you would like to do first.”
 30 seconds: quiet think time
Activity
 Invite students to work at the center of their choice.
 10 minutes: center work time
 “Choose what you would like to do next.”
 10 minutes: center work time
Student Facing
Choose a center:
How Are They the Same?
Which One?
Can You Draw It?
Activity Synthesis

“What did you like about the activities you worked on today?”