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"Penelitian ini adalah penelitian tindakan kelas (Classroom Aktion Research) yang bertujuan meningkatkan penguasaan rumus matematika melalui pemberian soal latihan bervarias....."

"This research aims at describing empirically on how to do evaluation on item quality of test result for mathematics conducted by school in improving the test instrument quality and assessment result. This test is multiple choices, where value 1 is intended for correct answer but value 0 for incorrect answer. This research was conducted at PPs UNJ, in April until Mey 2009. A finding outcome concludes that the evaluation on the test items quality can be found out by a parameter quality of the test item for model 3P. Within an empirical example is acknowledged that the Mathematics test with total 40 test items is found that there are 7 unsuitable items with model, and 33 test items that are good enough to be used and entirely this test is effective for the test participant target with competency ranging from -1,0"

"The objective of the present study is to find out the effect of problem-based performance assessment and instructional models on the students' metacognition in mathematics at senior high schools. The study was conducted in SMU in Jakarta. There were 120 first grade students as the sample of the study, selected through multistage random sampling. The data were gathered by using a metacognition scale. Data analysis was done by using the two way analysis of variance. The results of the study are: (1) In general, problem-based performance assessment effects students' metacognition mathematics, (2) Learning models affect the students' metacognition in mathematics; in which the cooperative learning model is more effective in improving the students' metacognition than the classical learning model, (3) There is an interaction effect between problem-based performance assessment and instructional models. Such interaction show that problem solving performance assessment is more effective in improving students' metacognition in mathematics if it is combined with cooperative learning model; while problem posing performance assessment is more effective if it is combined with classical learning model."