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This research aimed at describing the effect of contextual teaching learning (CTL) and numerical ability (NA) upon students’ achievment on mathematics. This quasi-experimental research used nonequivalent pretest-posttest control group designed. The population in this study were five clases of the eighth grade students of SMP Negeri 3 Abang in the academic year of 2016/2017. The selection of the samples for this study were based on random technique, four clases were selected as the samples, two clases as the experimental group with the CTL treatment and the others are the control group with conventional learning. The data of numerical ability and students’ achievment on mathematics were collected by test. The data obtained then were analyzed by using two ways Ancova. After treatment was controlled by pre-students’achievment on mathematics as a covariable,the results of this study were as followes. (1) There was a significant difference of students’ achievment bertween contextual CTL and conventional groups. Students who learned with CTL approach got higher achievment than them learned with conventional approach. (2) There was a significant difference of the students’ achievment between them with high numerical ability and them with low numerical ability. The students’achievment on mathematics of students who had high numerical ability was higher than them who had low numerical ability. (3) There was an interaction effect between learning approach (CTL approach and conventional approach) and numerical ability (high and low numerical ability) upon students’ achievement on mathematics.

Pengaruh Pendekatan Pembelajaran Kontekstual dan Kemampuan Numerik Terhadap Prestasi Belajar Matematika Siswa Kelas VIII SMP Negeri 3 Abang