Abstract
The purpose of this study is to determine whether there is a significant influence on giving reinforcement to students' mathematical self-concept. This research is a quantitative study using the Quasi-experimental method, the type of experimental design is the quasi-experimental method with the pretest-posttest control group design in two different classes which are divided into the experimental class and the control class. The population of this research is class VII MTsN 1 Padangsidimpuan and the sample class VII 3 is 32 students and VII 11 is 34 students. Then the data collection instrument is a questionnaire. Analysis of the data used is descriptive and inferential statistical formulas namely normality test and hypothesis testing with paired sample z-test. In accordance with the hypothesis testing using the Paired Sample z-test, the price obtained by the price of zcount = -11,858, which is greater than ztable = 1.96, according to the basis of decision making in the z Test, zilia calculated - ztable can be concluded H0 is rejected and Ha is accepted at a significance level of 5% (α = 0.05) this indicates that there is a significant effect of giving reinforcement to students' mathematical Self Concepts.
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