The Effect Applying Realistic Mathematics Education On Students' Reasoning Skills In The Math Subject of Series and Sequence In Grade XI at SMAN 8 Medan

This research aims to know whether the Jigsaw Cooperative Learning model affects students' mathematical communication skills and to know how effective is the Jigsaw-type cooperative learning model on students' mathematical communication skills. The design of this research is quasi-experimental. The sample of this research is students in class IX-E and students in class IX-F. The results of this research are: (1) The Jigsaw Cooperative Learning Model has a positive effect on students' mathematical communication skills. This can be seen from the significance value for the two-tailed test is observed as 0.031 < 0.05. Then, Ho is rejected and Ha is accepted. (2) The effectiveness of the Jigsaw Cooperative Learning Model is taken from the N-Gain result, which is 0.16. It can be concluded that the effectiveness of the jigsaw cooperative learning model on students' mathematical communication skills is in the moderate category