Service-learning provides a versatile pedagogical platform that can improve the academic performance of participating students and open space for a discussion of issues of social justice within a mathematics classroom. We describe our Precalculus course with a service-learning component, in which university students regularly tutor algebra prerequisites to students in the community. We provide interested readers with an insight into our instructor experience, thus helping them bring service-learning to a traditional mathematics course. We quantify the resulting gains in the content knowledge of student-tutors and a potential shift in their beliefs about mathematical problem solving. Reflective diaries provide a view of students' mathematical and personal growth. We hope that these manifest benefits may encourage mathematics departments to implement service-learning as part of their academic curricula.