The purpose of this study was to produce a suitable and effective Canva application-based mathematics learning medium for improving student learning outcomes at Betania Private Elementary School in Medan. The type of research used is ASSURE research and development. The research instruments used were initial needs questionnaires, material expert validation questionnaires, media experts, design experts, and student response questionnaires. This study also uses quantitative data analysis techniques (data on the feasibility and effectiveness questionnaire assessment) and qualitative data (observation data and documentation). Product validation results show a score percentage of 89.16% for material expert validation, 83.47% for media expert validation, 95% for design expert validation, and 98.75% for student responses. The results of the normality and homogeneity tests show that the research data has been declared normal and homogeneous. The results of the hypothesis test show that the value of t count is 1.98 and the value of t table is 1.66, where t count > t table. The results of this study indicate that Canva-based mathematics learning media are effective in improving student learning outcomes at Betania Private Elementary School, Medan.