The purpose of this research to produce TIMSS – like mathematics tasks on the numbers content by using Context Kingdom of Sriwijaya are valid and practical, and to see the potential effect resulting tasks. Subject of this research are students in grade VII.7 SMPN 55 Palembang. This research is design research in the type of development study consisting of preliminary and formative evaluation (methods). Produce of this research are 10 TIMSS – like mathematics tasks on the numbers content by using Context Kingdom of Sriwijaya are valid and practical, and has the potential effect on students' mathematical reasoning competencies, such as analyzing, integrating, making inferences, and give reasons. Moreover, it has the potential effect on student interest and seriousness of solving TIMSS – like mathematics tasks on the numbers content using Context Kingdom of Sriwijaya.
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