<p style="text-align: justify;">The aim of this work is to characterise the understanding that students in compulsory secondary education (14-16 years old) have of number sequences in graphical representations. The learning of numerical sequences is one of the first mathematical concepts to be developed in an infinite context. This study adopts the focus of semiotic representations as its theoretical framework. The participants consisted of 105 students and a qualitative methodology was used. The data collection instruments were a questionnaire and a semi-structured interview. The results allowed for three student profiles regarding number sequences in graphical representations to be identified. These profiles may facilitate a possible progression in the learning of number sequences for students in compulsory secondary education to be considered. Therefore, the results presented in this study can provide information about the learning hypotheses of mathematical tasks related to numerical sequences and can help in the design of such tasks.</p>
This paper aims to characterise an indicator of the development of the number sequence scheme among students at the level of Compulsory Secondary Education (14-16 years old students). To do so, we use a scheme development proposed by the APOS theory to characterise students' use of relations between mathematical elements when solving a mathematical task. We use a qualitative methodology and the data collection instruments are a written questionnaire and a semi-structured interview. In this work we show the questionnaire task that provides analytical expressions and ask students to determine which of them numbers sequences are. We find that students' use of logical implication when solving tasks related to number sequences is an indicator of the development of the scheme. This indicator helps to locate the transition mechanisms between the levels of development of the number sequence scheme. Moreover, our research shows that arithmetic and geometric progressions play a key role as an indicator of the development of the number sequence scheme.
Obligatoria (14-16 años), considerando como marco teórico APOS, a través del uso que hacen los estudiantes de los elementos matemáticos, las relaciones que se establecen entre ellos, los modos de representación y los modos de conocer que se ponen de manifiesto en la resolución de las tareas matemáticas que se les proponen. Nuestra metodología es cualitativa, usando datos provenientes de dos cuestionarios de distinta naturaleza. A partir del análisis conjunto de los dos cuestionarios contestados por cada estudiante, se caracterizan los distintos niveles de comprensión del esquema del concepto de sucesión como lista numérica. PALABRAS CLAVE: Sucesiones numéricas; Estudiantes de educación secundaria obligatoria; Teoría APOS; Desarrollo de un esquema. ABSTRACT • The aim of this research is to characterize the understanding of the numerical sequence concept in high school students (14-16 years old). The study draws on the APOS theory, which considers how students use mathematical elements, the relationships established between them, theirs modes of representation and the cognitive structures that are showed in the resolution of mathematical tasks. Our methodology is qualitative, using data from two questionnaires of diverse nature. The different levels of understanding of the scheme of the concept of numerical sequence were characterized taking into consideration the analysis of the two questionnaires.
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