Number Sense: Flexibility in Thinking about Numbers

The aim of this research is to understand the flexibility of students in solving problems related to number sense. Flexibility can be observed through the strategies used by students, whether they employ standard algorithmic procedures or utilize intuitive thinking strategies. This study is a qualitative research with a case study method. The research sample consists of 35 eighth-grade students who have covered the material of integers and have been given a written test. Test results are divided into two categories: students who solve problems using number sense strategies and students who do not use number sense strategies. In-depth interviews were conducted with two representative students who took the written test. The interview results indicate that students who solve problems with number sense strategies understand the concept of number density, while students who do not use number sense strategies do not yet have an understanding of the meaning of numbers. Overall, students tend to use procedural methods to solve the given problems. The results of this research are expected to be used as a basis for designing learning activities that accommodate number sense abilities.