Algebraic thinking process analysis of senior high school students in solving absolute value mathematics problem

The purpose of this study is to analyze the algebraic thinking process of SMA Negeri 1 Bojonegoro students in solving absolute value mathematics problem. The type of this research is qualitative descriptive. Based on report card grades, prospective subjects are classified into 3 ability categories: high thinking ability, medium thinking ability, and low thinking ability. The result obtained are students with high thinking ability are able to write and elaborate the mathematical models, apply the properties of inequality absolute values, and able to get the correct answer. Students with medium thinking ability are able to understand the problems contents, write and elaborate the mathematical models, and working carefully, but unable to make a different representation. Students with low thinking ability are able to understand the problems contents, and able to write and elaborate the mathematical models, but unable to develop a mathematical model that has been made correctly, wrong in executing the numbers in absolute sign, and wrong in making different representations.