Purpose: In this article, we explore how student authorship may be enhanced among learners in mathematics classrooms in a Hong Kong primary school through rich dialogue discourse. Design/Approach/Methods: Using qualitative methods, that is, coding and discourse analysis, we examine the relationship between student authorship and personal latitude through a case study of two Grade 4 mathematics lessons taught by two primary mathematics teachers, respectively. Findings: We discuss the study's findings in relation to how teachers can engage themselves and their students in dialogic discourse to offer student choices and opportunities and generate original voices. Originality/Value: Personal latitude was found when the students were given the choice to use their original voices. The learners assumed the role of author; consequently, authorship was enhanced in ensuing rich dialogic discourse.