<![CDATA[This research is a development research. The purpose of this study to develop mathematical song media with teaching material is mathematics material in elementary school flat material material that is triangle material, While the quality of mathematics song media will be described as covering the feasibility of the mathematics song media, the effectiveness of the mathematics song media in terms of student learning outcomes, and student responses to the media of mathematical songs The research development model uses a Thiag Subject development model consisting of 4 stages, namely: the define stage, the planning stage, develop and the disseminate stage. The instruments conducted in this study (1) evaluation sheets for material experts, and (2) evaluation sheets for media experts, both of which were assessed for eligibility, (3) posttest questions or learning outcomes sheets and student response questionnaire sheets for effectiveness. Based on the results evaluation of the development of the mathematical song media the results of the evaluation of the material experts got an average score of 4 while the evaluation results from the media experts obtained an average score of 4, so the mathematical song media was declared feasible. The posttest results showed that the percentage of triangle material is 80%, completeness. While the student response questionnaire was 3.11 so it can be concluded that the mathematics song media is very effective in growing interest in learning mathematics. Thus it can be concluded that the developed mathematical song media meets the criteria of feasible, effective and practical which can be used as good teaching material]]>
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