<![CDATA[This research is classroom-action research, which aims to increase both pupils' activity and achievement in mathematics. The subjects of this research is the students of class VIII which consisted of 30 students. Technique of collecting data using instrument: (1) pre-test, (2) observation sheet of teacher activity, (3) observation sheet of students activity, and (4) the learning outcome test. The data were analyzed using descriptive statistical analysis and descriptive analysis. The results show that (1) teacher activity increased, (2) students activity increased, (3) the average of students mathematics learning achievementare above the value of minimal criteria with a classical completeness level of 86,67%. From the research result can be concluded that the implementation of problem-based learning modeleith differentiation learning strategies can improve student learning achievement of class VIII.]]>
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