communication ability in resolving open-ended problems in mathematics

Open-ended problem solving is problem solving that presents a problem that has more than onecorrect answer or has more than one correct settlement method. the use of problem solving is not farrelated to communication. communication ability is very important ability in problem solving. thepurpose of research was to know student’s communication abilities in solving open-ended problems withthe material equation and quadratic function. the type of the research is descriptive qualitative researchwhich involving two students that is student with high communication ability and student with lowcommunication ability from one of smpn wonogiri. data collected through the results of written test andinterview the used triangulation methods to validate the data. based on research analysis show that: (1)written communication of the students in solving problems have different solutions; (2) the student withhigh communication ability is better at open-ended problem solving than the student with lowcommunication ability. this shows that students’ high communication ability have more than onesolution or answer especially in calculation problems, they have various solution to explain detail answer.