Exploring Students Mental Computing Based On Number Sense At 7th Grade Junior High School In Ponorogo

Abstract

The ability of number sense possessed by students will affect the performance of these students in determining the strategies used in solving a mathematical problem. Students who have a good number sense will show the mental characteristics of computing possessed. According to Markovits and Shower (1994), there are four levels of mental computation in the way students of solving numbers problems, namely: standard, transition, non-standard without reformulation, and non-standard with reformulation. Therefore this study aims to categorize how to answer students in solving numbers problems based on the ability of number sense possessed. This type of research is descriptive qualitative. Subjects selection use the purposive sampling method obtained three subjects that represent the number sense category owned by students. The results of this research indicate the students who have high number sense abilities tend to have computational mental with non-standard categories with reformulation while students who have medium and low number sense abilities tend to have standard category mental computation.