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This study is back grounded by students who had not maximally achieved concept understanding ability and problem solving ability in Social Sciences learning. Through this study, the solution to solve that problem is examined by applying learning which use Blended Learning system. Blended Learning is a learning system which integrate face-to-face learning with online learning. This study use quasi experiment conducted in SDN Tanjung III, Subang Regency. Experiment class use Blended Learning whereas control class use conventional face to face system. The instruments to conduct this study are: concept understanding and problem solving items derived from indicator of each variable and related to learning material of Social Sciences in Class V, teacher’s activity observation and student’s response sheet. The study result showed significant difference in concept understanding and problem solving ability between experiment class and control class, in which n-gain of Blended Learning system is better than the conventional face to face system, and there is increase in teacher activity and student’s response to learning in experiment class. Keywords—Blended Learning system; concept understanding ability; problem solving ability

Enhancing Concept Understanding and Problem Solving Ability by Using Blended Learning System in Social Sciences Learning in Grade V SDN Tanjung III