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The purpose of this Number Talk is to elicit strategies and understandings students have for adding groups of 2 and groups of 5. These understandings help students develop fluency and will be helpful later in this lesson when students need to use data in scaled bar graphs to solve one- and two-step “how many more?” and “how many fewer?” problems. Students use the structure of the expressions and repeated reasoning when they use methods based on skip-counting by 2 or 5 or counting on 2 or 5 from a previous known value (MP7, MP8).
Encuentra mentalmente el valor de cada expresión.
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A un grupo de estudiantes le preguntaron: “¿Cómo te sientes con el nuevo año escolar?”. Sus respuestas se muestran en esta gráfica de barras:
¿Cuántos estudiantes más están emocionados que nerviosos o curiosos por el nuevo año escolar?
If students find the sum of all categories or don't find a solution to the problems, consider asking: