<![CDATA[this research has purpose to know mathematics learning process by Mastery Learning model in order to can be increase of interest and achievement of study mathematics of fifth grade student in Muhammadiyah Mertosanan Elementary School Subdistrict of Banguntapan Regency of Bantul on the year of teaching 2012/2013. The kind of this research was Clasroom Action Research (CAR). This research were implemented in two of cycle with the subject are fifth grade student in Muhammadiyah Mertosanan Elementary School Subdistrict of Banguntapan Regency of Bantul on the year of teaching 2012/2013 that number are 23 students. The object of this research were all of process on application of Mastery Learning model to increased of interest and achievement of study in mathematics of student. The research data obtained from the observation during the lesson, questionnaire, documentation and the test of every cycle. The result of this research show that after applied of Mastery Learning model, interest and achievement of study in mathematics of student in mathematics learning are experience to be increase. Â suggestion in order to teacher of mathematics lesson can be apply Mastery Learning model as variation in to teach.]]>
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