# Lesson 1

Contemos y sumemos

## Warm-up: ¿Qué sabes sobre las matemáticas? (10 minutes)

### Narrative

The purpose of this activity is to elicit ideas students have about doing math. Students learn the What Do You Know About _____ routine, which will be used throughout the year. This routine provides an opportunity for all students to contribute to the conversation and for the teacher to listen to what knowledge students already have.

For all the routines, consider establishing a small, discreet hand signal that students can display to indicate they have an answer they can support with reasoning. This signal could be a thumbs-up, a certain number of fingers that tells the number of responses they have, or another subtle signal. This is a quick way to see if students have had enough time to think about the problem. It also keeps students from being distracted or rushed by hands being raised around the class.

### Launch

• Groups of 2
• Display the question.
• “¿Qué sabes sobre las matemáticas?” // “What do you know about math?”
• 1 minute: quiet think time

### Activity

• Record responses.

### Student Facing

¿Qué sabes sobre las matemáticas?

### Activity Synthesis

• “Hoy podrán hacer matemáticas de diferentes maneras” // “Today, you will get to do math in different ways.”

## Activity 1: Retomemos “Contar colecciones: Hasta 20” (20 minutes)

### Narrative

The purpose of this activity is for students to count collections of up to 20 objects and represent their count in a way that makes sense to them. Students may use drawings, numbers, or words to represent their count.

This activity provides an opportunity to gather formative assessment data on students’ counting skills and understanding. Some students may have more sophisticated counting methods such as grouping and counting by twos or tens (MP7). Students are not expected to do this at this point, as students will continue to engage in Counting Collections throughout the year. Collections of objects should be saved for use in later lessons.

10-frames are provided as a blackline master. Students will continue to use these throughout the year. Consider copying them on cardstock or laminating them and keeping them organized to be used repeatedly.

MLR8 Discussion Supports. Synthesis: Pair gestures with verbal repetition to demonstrate and clarify each strategy students share for keeping track of objects.
Engagement: Develop Effort and Persistence. Differentiate the degree of difficulty or complexity. Some students may benefit from starting with fewer objects to count.
Supports accessibility for: Conceptual Processing, Organization

### Required Materials

Materials to Gather

Materials to Copy

• 10-Frame Standard
• Counting Collections Stages 1 and 2 Recording Sheet, Spanish

### Required Preparation

• Create one collection of up to 20 objects such as buttons, counters, connecting cubes, paper clips, square tiles for each group of 2.

### Launch

• Groups of 2
• Give each group a collection of objects, two recording sheets, and access to 10-frames.
• Show students a collection of 10–20 objects.
• “Vamos a empezar contando. Ustedes y su compañero recibirán una colección de objetos como esta. Su tarea es averiguar cuántos objetos hay en su colección y luego mostrarlo” // “We are going to start with some counting. You and your partner will get a collection of objects like this one. Your job is to figure out how many objects are in your collection and show how many.”
• “¿De qué maneras ustedes y su compañero pueden trabajar juntos para contar la colección?” // “What are some different ways you and your partner can work together to count the collection?” (One person can count first and then the next can count to see if they get the same amount. We can take turns moving an object and counting a number.)

### Activity

• 10 minutes: partner work time
• “¿Cuántos objetos hay en su colección? ¿Pueden mostrarlo?” // “How many objects are in your collection? Can you prove it to me?”
• “¿Pueden hacer un dibujo para mostrar cómo contaron?” // “Can you draw a picture to show how you counted?”
• Monitor for students who organize their objects as they count and create a representation with drawings or numbers.

### Activity Synthesis

• Invite previously identified students to share.
• ¿Cómo sabían qué objetos ya habían contado mientras contaban?" // “How did you keep track of the objects as you counted?” (We put each object in a pile after we counted it so we knew we already counted that one.)
• Display previously selected representations.
• “¿Cómo mostraron ellos su conteo?” // “How did they show their count?” (They drew twelve circles. They wrote the number 12.)
• “Hoy contamos muchas colecciones de diferentes cosas. ¿Qué cosas cuentan ustedes en casa?” // “We counted lots of collections of different things today. What are some things you count at home?”

## Activity 2: Conozcamos “Carrera con números: Suma para obtener 10” (20 minutes)

### Narrative

The purpose of this activity is for students to learn a new stage in the center, Number Race. Earlier stages of this center were introduced in kindergarten. In this new stage, called Add to 10, students find the total number of dots on two dot cubes and record the number on their gameboard. This activity gives the teacher an opportunity to see the methods that students use. As students work, observe whether they count each dot to find the total, recognize the number of dots on each cube without counting, count on from one cube, or just know the sum of the two quantities. Students may have fluency with sums within 5, as that was the end of year expectation for kindergarten. Many students may be counting all, and some students may be counting on. It is important to let students develop their own ideas about counting on as this concept develops throughout the year. During the synthesis, students connect counting to addition as they consider representing the total number of dots with an addition expression.

### Required Materials

Materials to Gather

Materials to Copy

• Number Race Stage 3 Gameboard

### Launch

• Groups of 2
• Give each group two game boards and two dot cubes.
• Display the game board.
• “Ahora vamos a conocer un juego que se llama ‘Carrera con números: Sumemos hasta 10’. Juguemos una ronda juntos. Voy a lanzar ambos dados de puntos y encontrar el número total de puntos. ¿Cuántos puntos hay? ¿Cómo lo saben?” // “Now we are going to learn a game called Number Race, Add to 10. Let’s play a round together. I am going to roll both dot cubes and find the total number of dots. How many dots are there? How do you know?”
• 30 seconds: quiet think time
• 1 minute: partner discussion
• Share responses.
• Demonstrate writing the total at the bottom of the appropriate column.

### Activity

• “Jueguen por turnos con su compañero. Durante cada turno, lancen los dados de puntos, encuentren el número total de puntos y muéstrenle a su compañero cómo lo saben. Cuando se pongan de acuerdo, escriban el total encima del número en el tablero de juego. Si el total es más que 10, lancen los dados de nuevo” // “Take turns with your partner. During each turn, roll the dot cubes, find the total number of dots, and show your partner how you know. When you agree, record the total above the number on the game board. If the total is more than 10, roll the cubes again.”
• 10 minutes: partner work time
• As students work, consider asking:
• “¿Cuántos puntos hay en este dado?” // “How many dots are on this cube?”
• “¿Cómo encontraron el número total de puntos?” // “How did you find the total number of dots?”
• “Miren su tablero de juego. Hablen con su compañero sobre qué observan” // “Look at your game board. Talk to your partner about what you notice.”
• 2 minutes: partner discussion

### Student Response

If students are counting each dot on the dot cube, consider asking:

• “¿Cómo supiste cuántos puntos hay en este dado?” // “How did you know how many dots are on this cube?”
• Showing a different number of dots, ask “¿Puedes decir cuántos puntos hay en este dado sin contar?” // “Can you tell how many dots are on this cube without counting?”

### Activity Synthesis

• Display two dot cubes, for example five dots and three dots.
• “Hay muchas maneras en las que podemos encontrar el número total de puntos en los dos dados. Algunos contamos todos los puntos. Otros sumamos el número de puntos en cada dado.” // “There are different ways we can find the total number of dots on the two cubes. Some of us counted all of the dots. Some of us added the number of dots on each cube.”
• Point to one cube.
• “¿Cuántos puntos hay en este dado?” // “How many dots are on this cube?”
• Repeat with the second cube.
• “Podemos sumar estos dos números para encontrar el número total de puntos. Podemos escribir una expresión para mostrar que estamos sumando estos dos números.” // “We can add these two numbers to find the total number of dots. We can write an expression to show that we are adding these two numbers together.”
• Write the expression $$5 + 3$$.
• Roll the two cubes.
• “¿Qué expresión podemos escribir para mostrar que estamos juntando el número de puntos en cada uno de estos cubos?” // “What expression can we write to show that we are putting together the number of dots on each of these cubes?”

## Lesson Synthesis

### Lesson Synthesis

“Hoy contamos herramientas matemáticas y jugamos un juego matemático. Vamos a hacer una tabla de qué hacen ustedes y qué hago yo en nuestra comunidad matemática” // “Today we counted math tools and played a math game. We are going to make a chart of what you do and what I do in our mathematical community.”

### Math Community

Display chart:

“¿Qué ven y qué escuchan cuando hacemos matemáticas juntos como una comunidad matemática?” // “What does it look and sound like to do math together as a mathematical community?” (We talked to each other and to the teacher. We had quiet time to think. You asked us questions. We shared our ideas. We thought about the math ideas and words we knew. You were writing down our answers. You were waiting quietly until we gave the answers.)