This lesson is optional because it does not address any new mathematical content standards. This lesson does provide students with an opportunity to apply precursor skills of mathematical modeling (MP4).

In previous lessons, students used and interpreted results of survey data shown in a variety of representations, including drawings of the objects, symbols, tallies, and numbers. Students also created their own representations of categorical data. To interpret the data, students answered questions such as:

• “¿Cuántos hay de cada tipo?” // “How many of each kind?”
• “¿Cuántos hay en total?” // “How many in all?”
• “¿Cuántos hay de ___ o ___?” // “How many of ___ or ___?”

In this lesson, students create their own survey and collect data. Then they interpret the results in order to make a recommendation to the teacher about what activities the class should do when there is free time.