Fourteen fifth-grade students gather at the front of the classroom as their summer school instructor introduces Jonathan Bostic as the mathematics teacher for the week. Before examining any math problems, Bostic sits at eye level with the students and informs them that they will solve problems over the next four days by working individually as well as collaborating in small groups and as a whole class. A supportive environment where students feel comfortable sharing their solution strategies with one another is crucial for developing a positive classroom culture. Such a culture promotes "problem-solving discourse," which is student-centered, problem-focused dialogue among small groups or as a whole class. This article discusses how a four-day intervention proved highly successful and offers practical, specific guidelines for teachers to quickly develop a similar classroom culture.