This study aims to improve Mathematics learning outcomes using the Problem Based Learning (PBL) learning model. This research is classroom action research with the research subject of grade VIII-B MTs Negeri 3 Bantul students. Research is carried out in 2 cycles and each cycle consists of 2 meetings, covering 4 stages, namely planning, implementation, observation and reflection. Data collection of learning outcomes is obtained by end-of-cycle tests and processed quantitatively. The results showed that there was an increase in mathematics learning outcomes of grade VIII-B MTs Negeri 3 Bantul students on the "Opportunities" material. This is shown by a significant increase in student learning outcomes which reached an average score of 65 in cycle I and 74.19 in cycle II with learning completeness of 61% in cycle I and 80.6% in cycle II, an increase of 19.6%. Learning using PBL can be used as a reference in mathematics classes in the future.
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