This study describes the ways in which 36 preservice elementary teachers (PSETs) incorporated text into slides (n = 158) they designed for use with K-5 students during whole-group mathematics instruction. A qualitative content analysis was conducted to determine the extent and purposes for which the PSETs used slide text. Overall, 80% of slides contained text, which was closely aligned with what the PSETs planned to say during instruction. Text was used for three primary purposes: to convey information, to prompt student engagement, and to prompt teacher action. Study findings indicate that instruction in visual literacy skills should be incorporated into teacher education coursework if teacher educators expect PSETs to use slides effectively in their teaching. The findings also highlight the potential utility of slide text as a tool to support novice teachers as they learn to enact cognitively demanding teaching practices, such as engaging students in discussion during lessons. Collectively, the results suggest that slides designed for teaching should be viewed as shared spaces, to be used by and useful to both students and their teachers. Recommendations for ways PSETs may be taught to use slides as a shared space are included.