In this article, the authors introduce the Into Math Graph tool, which helps teachers learn about their students' mathematics-related experiences and mathematical engagement by inviting students to define and graph their engagement over time. This tool documents and allows teachers to understand how and why students' engagement increases, decreases, fluctuates, or remains the same. This tool was created for the Secondary Mathematics in-the-Moment Longitudinal Engagement Study (SMiLES) to help researchers understand how students experience and describe their mathematical engagement (Edusei, Jansen, and Mohammad Mirzaei 2019). Here, the authors discuss how they can use this tool as teachers, share examples of student responses, and discuss implications for practice.