<![CDATA[The objective of the study is to the produce students’ worksheet using the Guided Discovery Learning it is valid, practical and effective. This is a research and developmental design which adopted the model of Plomp. This developmental model includes phases preliminary research, prototyping phase and assessment phase. The subject of this study is the students of class VII MTs Labbaika Samarinda. The result of the study shows that the LKS is in the category of valid with mean 3,40. The result of the try-out show that it fulfills the practicality aspect which is useful and achieves the category of high with mean 3,77. The worksheet is also effective. It was proved by (1) 85,29% of students, who take the subject of mathematics using worksheet developed, achieve the minimum passing grade and (2) All students give positive response to the activities of learning and teaching of mathematics using developed worksheet.]]>
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