The aim of this research is to improve interests and outcome of learning Mathematics of Eighth grade students of SMP Taman Dewasa Pawiyatan Yogyakarta, employing the Small Group Work model. Action Hypothesis proposed in this study is that the Small Group Work model is able to enhance the interest and outcome of learning Mathematics of the Eighth grade students of SMP Taman Dewasa Ibu Pawiyatan Yogyakarta. The research applies the Classroom Action Research, particularly using apparent experiment conducted, at least, in 2 cycles. The subject appointed is the Eighth grade students of SMP Taman Dewasa Ibu Pawiyatan Yogyakarta. There are 19 students consisting of 9 male students and 10 female students. The object opted is Mathematics learning through Small Group Work model to determine their interest and the outcome of Mathematics learning in Algebra operation. The required data is gathered through using observation sheets, questionnaires, tests, field documentation and notes. The instruments are assessed using validity and reliability tests. The research findings indicate that the application of Small Group Work model is proven to improve students’ interest and their learning outcome. This can be presented by the increasing of student’s interest average percentage based on the observation sheets in each cycle. In the first cycle, the students’ interest is as much as 62,71%, and for the second cycle achieves 79,82%. It is also supported by the questionnaire data that shows the increasing number in the first to the second cycle, from 79,83% to 85,11%. The increasing fashion also takes place in the students’ Mathematics average score. The average score for the first cycle is 48,42 up to 58,95, and for the second cycle turns to 71,84. It is confirmed in this research that the Small Group Work model can enhance students’ interest and the Mathematics learning outcome. It is expected that teachers can put this learning model in practice.
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