The purpose of this Warm-up is to elicit the idea that bar graphs need a title and a scale in order to communicate information clearly (MP6), which will be useful when students draw a scaled bar graph in a later activity. During the Activity Synthesis, focus the discussion on the unknown scale.

• “¿Una unidad o un espacio entre dos líneas de la gráfica podría representar 1 estudiante? ¿Por qué sí o por qué no?” // “Could each unit or each space between two lines on the graph represent 1 student? Why or why not?” (No, because that would mean half of a student likes red, blue, and orange.)
• “Si cada unidad de la gráfica representa 2 estudiantes, ¿cuántos estudiantes dicen que el rojo es su color favorito?” // “If each unit on the graph represents 2 students, how many students have red as their favorite color?” (13) "¿Y si cada unidad representa 4 estudiantes?" // “What if it represents 4 students?” (26)
• “¿Cómo pueden decidir qué escala usar en su gráfica?” // “How should you decide on a scale for your graph?” (Think about how many people you surveyed, and use a scale that will fit them on your graph. Use a scale that will make the bar graph easy to read.)

• “Dime cómo escogiste la escala de tu gráfica” // “Tell me how you chose the scale for your graph.”
• “¿Cómo podrías ajustar la escala de tu gráfica para que quepan todos los datos que recolectaste?” // “How could you adjust your scale so the graph fits all of the data you collected?”