Lesson 16
Center Day 3
Warm-up: Number Talk: Add 20 and 1 (10 minutes)
Narrative
Launch
- Display one expression.
- “Give me a signal when you have an answer and can explain how you got it.”
- 1 minute: quiet think time
Activity
- Record answers and strategies.
- Keep expressions and work displayed.
- Repeat with each expression.
Student Facing
Find the value of each expression mentally.
- \(65 + 20\)
- \(85 + 1\)
- \(65 + 20 + 1\)
- \(65 + 21\)
Student Response
Teachers with a valid work email address can click here to register or sign in for free access to Student Response.
Activity Synthesis
- “Why do the last three expressions all have the same value?” (They are all adding \(65 + 20 + 1\) in different ways.)
Activity 1: Introduce Counting Collections, Estimate and Count Up to 120 (20 minutes)
Narrative
The purpose of this activity is for students to learn stage 3 of the Counting Collections center. Students are given a collection of up to 120 objects. They record an estimate for how many objects they think are in their collection. Then, they work with a partner to figure out how many objects are in their collection. Each partner records how many. Students may draw pictures, write numbers or equations, or use base-ten representations to represent their collection.
Supports accessibility for: Attention, Memory
Required Materials
Materials to Gather
Materials to Copy
- Counting Collections Stage 3 Recording Sheet
Required Preparation
- Create a collection of up to 120 objects per group of 2 students (buttons, two-color counters, linking cubes, paper clips, pattern blocks, square tiles).
Launch
- Groups of 2
- Give each group two recording sheets, a collection of objects, and access to tools to help organize their count.
- “We are going to do more Counting Collections.”
- “This time, you will estimate how many objects are in your collection before you count them. Record your estimate, then count the collection. Record your count.”
Activity
- 15 minutes: partner work time time
Activity Synthesis
- “How did you organize the objects in your collection as you counted?”
Activity 2: Centers: Choice Time (20 minutes)
Narrative
The purpose of this activity is for students to practice measuring lengths and writing numbers up to 120.
Students choose from any stage of previously introduced centers.
- Write Numbers
- Estimate and Measure
Advances: Speaking
Required Materials
Materials to Gather
Required Preparation
- Gather materials from:
- Write Numbers, Stages 1–3
- Estimate and Measure, Stage 1
Launch
- Groups of 2
- “Now you are going to work on centers we have already learned.”
- 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.
- 8 minutes: center work time
- “Choose what you would like to do next.”
- 8 minutes: center work time
Student Facing
Choose a center.
Write Numbers
Estimate and Measure
Activity Synthesis
- Display numbers 108, 109, 110, 111, 112.
- “What do you notice about these numbers?” (They all have 100. Some have a zero and some don’t. The numbers go in order 8, 9, 10, 11, 12.)