Abstract
Scientific skill is a special skill helping students to develop their knowledge. Indirectly, well-developed scientific skill will lead them to actively get involved. This special skill needs to be developed through cognitive skill. One of the developed cognitive skills is justification skill. Such skill is developed through experiential learning. This research involves 26 students in one of Junior High Schools in Serang. This research focuses on topics about line, angle, triangle, and rectangle. This research is quasi experimental research with One Group Pretest Posttest Design using Purposive Sampling technique. The result of analysis shows that students’ mathematical justification skill of Junior High School gives positive contribution through experiential learning.
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