# Lesson 1

Contemos colecciones grandes de objetos

## Warm-up: Conteo grupal: Contemos hasta 80 y contemos empezando desde un número (10 minutes)

### Narrative

The purpose of this warm-up is for students to extend the verbal count sequence to 80 and to count on from a given number. As students count, point to the numbers posted so that students can follow along.

### Launch

• “Contemos hasta 80” // “Let’s count to 80.”
• Count to 80 1–2 times as a class.

### Activity

• “Ahora, empiecen en el número 10 y cuenten hasta 20” // “Now, start at the number 10 and count to 20.”
• Count on from 10 to 20.
• Record as students count.
• Repeat 3–4 times starting with other numbers within 20.

### Activity Synthesis

• “Contamos y anotamos los números del 10 al 20. Encuentren y señalen el número 11. Cuéntenle a su pareja cómo encontraron el número 11” // “We counted and recorded the numbers from 10 to 20. Find and point to the number 11. Tell your partner how you know you found the number 11.”
• Repeat 2–3 times with other numbers 11–20.

## Activity 1: Contemos colecciones (10 minutes)

### Narrative

The purpose of this activity is for students to count their collection in a way that makes sense to them. Students may use the counting mat or 10-frame to organize objects as they count. Students use appropriate tools strategically as they choose which tools help them count their collections (MP5). As students share how many objects are in their collection, write or display the number to record their count.

If there is additional time, invite students to count more than 1 collection of objects.

Action and Expression: Internalize Executive Functions. Invite students to plan a strategy for how they will count their collection. Encourage students to think about the tools they will use to count the number of objects in the collection. If time allows, invite students to share their plan with a partner before they begin. Supports accessibility for: Organization

### Required Materials

Materials to Gather

### Required Preparation

• Each student needs a collection of 11–20 objects.

### Launch

• Groups of 2
• Give each student a collection of objects and access to 10-frames and a counting mat.
• “¿Cuántos objetos hay en su colección?” // “How many objects are in your collection?”

### Activity

• 5 minutes: independent work time

### Student Response

If students recount the group of objects when asked “¿cuántos hay?” // “how many?”, consider asking:

• “¿Puedes decirme cuántos objetos hay sin contarlos otra vez?” // “Can you tell me how many objects there are without counting them again?”
• If needed, demonstrate counting the group of objects and after saying the last number, ask “¿Qué nos dice el número_____?” // “What does the number ___ tell us?”

### Activity Synthesis

• “Cuéntenle a su pareja cómo descifraron cuántos objetos hay en su colección” // “Tell your partner how you figured out how many objects are in your collection.”
• Invite 2–3 students to share how they counted their collection.
• After each student shares, display the number and say, “Hay _____ objetos en su colección” // “There are _____ objects in their collection.”
• “En la próxima actividad, vamos a compartir diferentes formas en las que contamos nuestras colecciones” // “In the next activity we will share different ways that we counted our collections.”

## Activity 2: Cómo contamos (10 minutes)

### Narrative

The purpose of this activity is for students to describe different methods that help them count collections of objects. Consider adding visual cues to the chart created in this activity and leaving it displayed for students to refer to throughout the unit. When students explain how they could count the disorganized cubes, they attend to precision in counting accurately (MP6).

MLR8 Discussion Supports. As students share their strategies, annotate the display to illustrate connections. Use verbal descriptions along with gestures, drawings, or concrete objects to demonstrate each method. For example, read “Podemos poner los cubos en un tablero de 10 y después contarlos” // “We could put the cubes on a 10-frame and then count them” and point to the 10-frame.

### Required Materials

Materials to Gather

### Required Preparation

• Create a pile of 4 connecting cubes to display.
• Create a pile of 13 connecting cubes to display.
• Students need the collections of 11-20 objects from the previous activity.

### Launch

• Groups of 2
• Display 4 connecting cubes in a scattered arrangement.
• “¿Cuántos cubos hay? ¿Cómo lo saben?” // “How many cubes are there? How do you know?” (There are 4 cubes. I can just see 4. I counted 1, 2, 3, 4).
• 30 seconds: quiet think time
• 1 minute: partner discussion
• Share responses.
• Display 13 cubes in a pile.
• “¿Cuántos cubos hay?” // “How many cubes are there?” (We can’t see how many there are. There are a lot.)
• 30 seconds: quiet think time
• 1 minute: partner discussion
• Share responses.

### Activity

• “¿Qué podemos hacer para descifrar cuántos cubos hay?” // “What can we do to figure out how many cubes there are?”
• 1 minute: quiet think time
• 1 minute: partner discussion
• If needed, ask “¿Como contarían esta colección de cubos?” // “How would you count this collection of cubes?”
• Share and record responses on a chart.

### Activity Synthesis

• “Hablamos y escribimos sobre las diferentes formas en las que podemos contar colecciones de objetos. Intercambien colecciones con su pareja y descifren cuántos objetos hay en su nueva colección. Si les ayuda, pueden contar su colección de una de las formas sobre las que hablamos” // “We talked about and wrote down many different ways that we can count collections of objects. Switch collections with your partner and figure out how many objects are in your new collection. If it is helpful, you can choose to count your collection in one of the ways that we talked about.”
• 3 minutes: independent work time

## Activity 3: Conozcamos “Carrera con números: Números del 11 al 20” (25 minutes)

### Narrative

The purpose of this activity is for students to learn stage 2 of the Number Race center. Students practice recognizing and writing numbers 11–20 as they roll a connecting cube onto the mat and trace the number that it lands on. To support their developing number recognition, students can match the symbol on the number mat to the symbol on the recording sheet. Students continue rolling and tracing until one number “wins” (all of the numbers in the column are traced). After students have traced all of one number, they can finish tracing the rest of the numbers. Students can use different colors or writing utensils during this center. In a future variation of this center, students will write the numbers instead of tracing them.

After they participate in the center, students choose from any stage of previously introduced centers.

• Subtraction Towers
• 5-frames

Students will choose from these centers throughout the section. Keep materials from these centers organized to use each day.

### Required Materials

Materials to Gather

Materials to Copy

• Number Mat 11–20
• Number Race Stage 2 Recording Sheet for Tracing

### Required Preparation

• Gather materials from:
• Subtraction Towers, Stage 1
• 5-frames, Stages 1 and 2

### Launch

• Groups of 2
• Give each student a recording sheet and access to colored pencils or other writing utensils. Give each group of students a number mat and a connecting cube.
• “Vamos a jugar ‘Carrera con números’ con números del 11 al 20” // “We’re going to play Number Race with numbers 11–20.”
• Display the recording sheet and number mat.
• “¿Qué pasos seguimos para jugar ‘Carrera con números’ con nuestra pareja?” // “What steps do we take to play Number Race with our partner?”
• 30 seconds: quiet think time
• 30 seconds: partner discussion
• Share responses.
• If needed, review the steps for Number Race with students.
• “Tomen turnos con su pareja. En cada turno, lancen el dado y tracen el número en la hoja de registro. Jueguen hasta que hayan trazado todas las casillas de un número. Ese número es el ganador” // “Take turns with your partner. During each turn, roll the cube and trace the number on the recording sheet. Play until you’ve traced all of one number. That number is the winner.”

### Activity

• 8 minutes: partner work time
• “Ahora pueden escoger otro centro. También pueden seguir jugando ‘Carrera con números’” // “Now you can choose another center. You can also continue playing Number Race.”
• Display the center choices in the student book.
• Invite students to work at the center of their choice.
• 10 minutes: center work time
• If time, invite students to choose another center.

### Student Facing

Escoge un centro.

Carrera con números

Torres para restar

Tableros de 5

### Activity Synthesis

• Invite a student to share their completed recording sheet.
• Point to and say each number. Invite students to chorally repeat each number.
• “¿Cuáles números sacaron más de 3 veces?” // “Which numbers did they roll more than 3 times?”
• “¿Cuáles números sacaron menos de 4 veces?” // “Which numbers did they roll less than 4 times?”

## Lesson Synthesis

### Lesson Synthesis

“Hoy hablamos sobre las diferentes formas de contar colecciones grandes de objetos. ¿En qué se parece contar colecciones grandes de objetos a contar colecciones pequeñas de objetos? ¿En qué es diferente?” // “Today we talked about different ways to count larger collections of objects. How is counting larger groups of objects like counting smaller groups of objects? How is it different?” (You still have to make sure that you count all of the objects one time. Sometimes when the collection is smaller, you can just see how many there are. It is quicker to count smaller collections of objects. It is easier to lose track with a larger collection of objects.)