# Lesson 13

Comparemos datos sobre nuestros materiales de arte favoritos

## Warm-up: Observa y pregúntate: Más y menos (10 minutes)

### Narrative

This warm-up prompts students to consider data representations, which they worked with in a previous unit. When students articulate what they notice and wonder, they have an opportunity to attend to precision in the language they use to describe what they see (MP6). They might first use less formal or imprecise language, and then restate their observation with more precise language in order to communicate more clearly.

### Launch

• Groups of 2
• Display the image.
• “¿Qué observan? ¿Qué se preguntan?” // “What do you notice? What do you wonder?”
• 1 minute: quiet think time

### Activity

• “Discutan con su pareja lo que pensaron” // “Discuss your thinking with your partner.”
• 1 minute: partner discussion
• Share and record responses.

### Student Facing

¿Qué observas?
¿Qué te preguntas?

### Activity Synthesis

• “¿Cuál podría ser el título de este diagrama?” // “What could the title of this diagram be?”

## Activity 1: Comparemos datos (parte 1) (20 minutes)

### Narrative

The purpose of this activity is for students to determine whether comparison statements about data are true or false and explain how they know. Students build on their work with asking and answering how many in all questions about data and their work with solving Compare story problems.

Students may use matching techniques to compare the physical data using objects and drawings. Students explain how they know whether the statements are true or false.

It is important to revoice student responses in which students use the word “less” instead of “fewer.” For example, revoice “There are less students who chose crayons.” as “There are fewer students who chose crayons.” For Spanish speaking students, the single word “menos” is used for both “fewer” and “less” so the previous clarification does not apply.

• Groups of 2

### Activity

• “Priya y Han hicieron algunas afirmaciones sobre sus datos. Ustedes deben decidir si están de acuerdo o en desacuerdo. Cuando decidan, marquen su respuesta en sus hojas” // “Priya and Han made some statements about their data. Your job is to decide whether you agree or disagree. Once you decide, circle it on your paper."
• 3 minutes: independent work time
• “Ahora expliquen a su pareja cómo lo saben” // “Now, explain to your partner how you know.”
• 3 minutes: partner discussion
• Monitor for two students who solve and represent problem 3 in different ways.

### Student Facing

A un grupo de estudiantes le preguntaron: “¿Cuál es tu material de arte favorito?”.
Sus respuestas se muestran en esta tabla.

1. Más estudiantes votaron por crayones que por marcadores.

2. Menos estudiantes votaron por crayones que por pintura.

3. Por marcadores votaron tres estudiantes más que por crayones.

Muestra cómo pensaste. Usa dibujos, números o palabras.

4. Por pintura votó un estudiante más que por crayones.

Muestra cómo pensaste. Usa dibujos, números o palabras.

5. Por pintura votó un estudiante menos que por marcadores.

Muestra cómo pensaste. Usa dibujos, números o palabras.

Si te queda tiempo: cambia las afirmaciones falsas para volverlas verdaderas.

### Student Response

If students identify how many voted for each category, but label true statements as false, or false statements as true, consider asking:

• “¿Cómo puedes saber cuántos estudiantes votaron por (crayones, pintura, marcadores)?” // "How can you tell how many students voted for (crayons, paint, markers)?"
• “¿Cómo podrías usar los cubos encajables para comparar las categorías?” // "How could you use connecting cubes to compare the categories?"

### Activity Synthesis

• Invite previously identified students to share.
• “¿En qué se parecen estas representaciones? ¿En qué son diferentes?” // “How are these representations the same? How are they different?”
• “¿Qué ecuación puedo escribir que corresponda a su trabajo?” // “What equation can I write to match their work?” ($$5 + 3 = 8$$, $$8 - 5 = 3$$)
• “¿Cómo se relaciona cada ecuación con la afirmación?” // “How does each equation relate to the statement?” (Five is the number of votes for crayons, and then adding 3 shows the difference between crayons and markers; if you start with the number for markers and take away how many voted for crayons, you see that it is 3 fewer votes.)
• If needed, ask, “¿Cuál parte de esta ecuación representa la respuesta al problema?” // “Which part of this equation represents the answer to the problem?”
• Draw a box around the 3.

## Activity 2: Comparemos datos (parte 2) (15 minutes)

### Narrative

The purpose of this activity is for students to solve Compare, Difference Unknown problems about data that include the language, “more” and “fewer”. Students write equations that match the story problems. They may use matching techniques to compare the data using objects and drawings, and during the synthesis, explore how to see the difference in a drawing and relate it to addition and subtraction equations (MP2). Students may want to tear out the page in their book with the data, so they can have it more readily available while working on each problem.

MLR8 Discussion Supports. Revoice student ideas to demonstrate and amplify mathematical language use, encouraging “more” and “fewer”. For example, revoice the English speaking student statement “Three less like paint” as “Three fewer students voted for paint than for crayons.” For Spanish speaking students, the single word “menos” is used for both “fewer” and “less” so the previous clarification does not apply.

Engagement: Develop Effort and Persistence. Chunk this task into more manageable parts. Check in with students to provide feedback and encouragement after each chunk.
Supports accessibility for: Attention, Organization

### Launch

• Groups of 2
• Display Favorite Art Supply data (do not include the problems).
• 30 seconds: quiet think time
• 1 minute: partner discussion
• Share responses.

### Activity

• “Ahora van a responder algunas preguntas sobre los datos” // "Now you are going to answer some questions about the data."
• 5 minutes: independent work time
• “Compartan con su pareja cómo pensaron” // “Share your thinking with a partner.”
• 5 minutes: partner discussion

### Student Facing

A otro grupo de estudiantes le preguntaron: “¿Cuál es tu material de arte favorito?”.
Sus respuestas se muestran en esta tabla.

1. ¿Cuántos estudiantes más votaron por crayones que por pintura?
Muestra cómo pensaste. Usa dibujos, números o palabras.

2. ¿Cuántos estudiantes menos votaron por marcadores que por pintura?
Muestra cómo pensaste. Usa dibujos, números o palabras.
3. ¿Cuántos estudiantes más votaron por crayones que por marcadores?
Muestra cómo pensaste. Usa dibujos, números o palabras.

4. ¿Cuántos estudiantes menos votaron por marcadores que por crayones?
Muestra cómo pensaste. Usa dibujos, números o palabras.

### Activity Synthesis

• Display, 'How many more students voted for crayons than markers?'
• “Sabemos que diez estudiantes votaron por crayones y seis estudiantes votaron por marcadores. Representemos estos votos usando letras” // “We know that ten students voted for crayons and six students voted for markers. Let’s represent these votes using letters.”
• Record:
• “La C representa los votos por crayones y la M representa los votos por marcadores. ¿Cuántos votos más por crayones hay? ¿Cómo lo saben?” // “C stands for the number of votes for crayons and M stands for the number of votes for markers. How many more votes for crayons are there? How do you know?” (4. I can see that there are 4 extra Cs.)
• “¿Qué ecuaciones podemos escribir?” // “What equations can we write?” ($$6 + \boxed{4} = 10$$ or $$10- 6=\boxed{4}$$)
• If needed, write $$10 - 6=\boxed{4}$$.
• “¿Qué numero representa la respuesta en cada ecuación?” // “What number in each equation represents the answer?” (4)
• “Cuando comparan dos números ustedes encuentran la diferencia. Cada una de estas ecuaciones nos ayudó a encontrar la diferencia. La diferencia entre el número de estudiantes que votaron por crayones y el número de estudiantes que votaron por marcadores es cuatro” // “When you compare two numbers you find the difference. Each of these equations helped us find the difference. The difference between the number of students who voted for crayons and those who voted for markers is four."

## Lesson Synthesis

### Lesson Synthesis

Display 'How many fewer students voted for markers than paint?'

“Hoy mostramos cómo escribir ecuaciones que corresponden a nuestro trabajo y que muestran cuál número representa la diferencia. ¿Qué ecuaciones que correspondan al problema podemos escribir? ¿Cuál número representa la diferencia?” // “Today we showed how to write equations that match our work and show which number represents the difference. What equations can we write that match the problem? Which number represents the difference?”