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The development of mathematical reasoning is present in most curricula around the world. More specifically, like other curricula around the world (OECD, 2019), Québec curriculum (Gouvernement du Québec, 2002) suggests the use of manipulatives as a way to foster mathematical reasoning in elementary classes. Yet, most research on manipulatives focuses on whether students are more successful in math when using them (e.g. Carbonneau et al (2013)). And, we still have very little information about the use itself and how different teachers' practices shape mathematical reasoning. This poster uses data from the project [anonymized], which aims to address this issue by studying how students use manipulatives to solve different tasks in relation to those practices. More specifically, we will present the analysis of students' mathematical reasoning when solving a word problem involving fractions in relation to different pedagogical choices.