<![CDATA[The aims of this research are to improve student’s motivation and their achievement in learning Mathematics at Mathematics lesson students class VIIA SMP Negeri 3 Temanggung year 2012/2013. The action hypothesis of this research is the open-ended approach in studying Mathematics can improve the learning motivation and student’s achievements in learning Mathematics for students class VIIA SMP Negeri 4 Temanggung year 2012/2103 .The research belongs to class action research that happened by collaborating with Mathematic teachers. The subjects of this research are the students of VIIA SMP N 3 Temanggung that consist of 32 students. The data collecting technique of this research are by using observation sheets, questionnaires sheets and test. The data analysis technique for the observation sheet and the questionnaires sheet is by counting every indicator. Then for the students achievement is counted by counting the average score of the test. The finding of this research shows that after the open-ended approach used in teaching Mathematics, the student’s learning motivation and their achievement in learning Mathematics are improved. Those are seen from the progress of the percentage result of the average on the observation of student’s motivation in every cycle, that is pre cycle on 73, 13% and improve on the cycle 2 on 80, 38%, besides that, the result of the questionnaires sheet also been supported by the result of student’s learning motivation questionnaires which are improve for each cycle, that are pre cycle on 71,00% then improve again to 81,00% and improve again on the cycle 2 to 88,97%. Besides that, the average of the students achievements on Mathematics study are improve from the first competence 70,23 become 80,17 on the cycle 1 and for the cycle 2 become 86,45. Remembering the open-ended approach can improve the learning motivation and can improve the student’s achievement on Mathematics, the researcher hopes schools can use and implement the approach as the learning model]]>
