This study aims to determine the differences in increasing mathematical communication skills between students who obtain STAD type cooperative learning and students who receive direct instruction learning, as well as the effects of both learning on increasing students' mathematical communication skills. This research is a quasi-experimental study with a sample of 62 students from two different schools. The instrument used in this study was a test of mathematical communication skills. The results of this study indicate that there are significant differences in the improvement of mathematical communication skills between students who take STAD type cooperative learning and students who take direct instruction learning, and the effect of STAD type cooperative learning and direct instruction on an increase in students' mathematical communication skills by 76% or in the moderate category .
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