Do you assign roles like “materials” or “group leader” when students work in groups? Why not assign "Math Practice 5: Use appropriate tools strategically," instead? These group roles assign each student a Math Practice Standard in order to focus their participation within the group. In my classroom when we work through an activity, I put my students in groups of 4 and pick the 4 most relevant Math Practice Standards for the day. Each group member has one Math Practice Standard to focus on and t