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The Difference Between Student's Learning Outcomes In Math Using REACT Strategy And Ekspository Strategy In Junior High School 24 Jakarta. Paper. Jakarta: Mathematics Education Study Program, Faculty of Teacher Training and Education University Muhammadiyah Prof. DR. HAMKA. 2018. This research is intended to find out the difference between student's learning outcomes in math using REACT strategy and ekspository strategy in junior high school 24 jakarta. The research population takes in all student of grade VIII. This research was was conducted at 24 Junior High School Jakarta grade VIII second semester of academic year 2017/2018. This research uses the quasi experimental method with posttest-only design which used cluster sampling method to obtained sample that respresentative and it got 69 students, consist of 34 students of experimental class 1 and 35 students of experimental class 2. The result of this research is that there is a difference on student's learning outcomes in math using REACT strategy and Ekspository strategy in junior high school 24 Jakarta. The ressult can be seen from the average value of the student’s learning outcomes in math which learn by REACT strategy were higher than the value of the student’s learning outcomes in math which learn by Ekspository strategy.