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The study aims at finding out the effect of Realistic Mathematical Learning Approach toward Mathematic Communication Skill and positive attitude in Mathematic of Seventh grade students at Private Junior High School R.A. Kartini Sei Rampah and to discover whether there is an interaction between learning approach and students PAM toward Mathematic Communication Skill and students positive attitude in Mathematic. This is a quasi experimental study. The population of the study is all private junior high school students of R.A Kartini Sei Rampah. Sample of the study is 34 students of VII-3 as experiment group, and 34 students of VII-6 as control group who were chosen by using purposive sampling. The data of the study is analyzed by using 2 way-ANAVA. The result of the study shows that : (1) There was an influence of the PMR approach to the Mathematical communication skills of junior high school students, (2) There were influences of the PMR approach to the positive attitude of junior high school students to mathematics, (3) There were interactions between learning approaches and students initial mathematical knowledge in influencing students mathematic communication skills, (4) There were no interactions between the learning approach and students initial Mathematic knowledge in influencing the students positive attitudes in Mathematic, (5) Mathematic communication skills and positive attitudes of junior high school students who learn by using the PMR approach are better than those who use conventional learning approaches.