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The purpose of this study was to describe the effectiveness of the use of mathematical learning devices based on the contextual teaching and learning approach in terms of students mathematical communication skills. The subjects of this study are seventh grade students of SMPN 26 Padang with a total of 30 students. This research includes the type of development research. The development model used in this study is the Plomp model. The Plomp model consists of three phases namely preliminary research, development or prototyping stage and assessment phase. Data on the effectiveness of learning devices are taken from the results of tests of students mathematical communication skills. From the test results, it is found that the average test scores of mathematical communication skills of class VII students are effective. The percentage of the results of the mathematical communication skills test reaches 80% of the minimum completeness criteria. Based on the results of these studies indicate that the learning device developed has been able to meet the effectiveness criteria, namely the percentage of completeness in classical more than 75%.