The subject of this research is about teaching and learning sequences and series in primary education. The research question is to understand how favorable is the use of the theory of semiotic representation registers to create activities that help students to learn. Were created ten activities about sequences and series and four of these were chosen to be used in a classroom with 1 st year students of a secondary school. By observing these activities being used in classroom, evidences were searched to evaluate if including different semiotic representation registers facilitates student's learning on mathematics. As a secondary aim, the student's infinity conception is investigated in the classroom. We also researched mathematics' history to find different conceptions adopted by philosophers and mathematicians on infinity. As sequences and series are also studied in college, some transition difficulties (from High School to College) were discussed considering cultural differences between the two educational levels. It was concluded that concrete teaching materials to the students' comprehension and the students' concept of infinity is mainly linked to potential infinity.
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