In this lesson, students practice identifying proportional relationships as they complete the first Info Gap activity in the grade 7 course. Students are presented with a problem statement without the information needed to solve the problem. They must brainstorm what information is needed and ask questions to obtain that information. In this case, students must determine that the situation involves a constant rate and find the constant of proportionality. Then, they write an equation to represent the proportional relationship and use the equation to solve a problem.

In the Warm-up activity, the teacher walks students through the process of asking for information needed to solve a problem. Then, students practice the Info Gap routine for themselves in small groups. To obtain all the necessary information, students need to persevere in asking questions (MP1) and to communicate precisely (MP6).

The last activity is optional because it provides an opportunity for additional practice with a new context.