Mathematics is one of the difficult subjects, many students have difficulty in learning mathematics and have a bad impact on students' attitudes and learning motivation. This is caused by the lack of competence that students have in understanding mathematical concepts. This study aims to determine the effect of mathematical disposition on the ability to understand mathematical concepts. The research method is quantitative research with correlational survey method with simple regression analysis. The target population, namely all students of the Malahayati Islamic Middle School. The population reached was only the VIII grade students of Malahayati Islamic Junior High School. The research sample amounted to 26 respondents with a simple random sampling technique. The research instrument was a mathematical disposition questionnaire and a question about the ability to understand mathematical concepts. The technique of data analysis was done by correlation test and simple regression test. Overall, it can be said that there is a positive and insignificant effect on students' ability to understand mathematical concepts.

<p>This research aims to know the influence of interest in learning mathematics achievement. The benefits of this research is to analyze the effect of minatterhadap the achievements of learning math. The methods used in this study is the analysis of the comparison with the present exposé performed on class X students in SMK Negeri 1 Cikarang Barat, Kab. Bekasi. The sample in this research totalled 67 people were taken with learners how random population of as many as 207 affordable learner people. The instruments used in the form of the now 30-grain statements and already validated in empirical. Data analysis the results of research done in a descriptive and inferensial use  "test " t, with the first test of its homogeneity and normality. Based on data processing, obtained summary there are significant effects of interest to learning achievements learning mathematics in class X students in SMK Negeri 1 Cikarang Barat, Kab. Bekasi, West Java. This can be evidenced by the acquisition value t_hitung &gt; t_tabel  6.610 &gt; 1.960.</p>

<p>The purpose of this study was to determine the contribution of logical intelligence and interest in learning to Mathematics achievement. The method used in this study from survey and the study was conducted in SMA Depok municipality. Techniques used in the data collection done by using a questionnaire written test multiple choice test and questionnaire. Analysis of the data in this study using descriptive statistical methods with multiple regression testing.where this research results showed in: there is a significant influence jointly between logical intelligence variables (X1) and interest in learning (X2) on mathematics achievement (Y),which means learners have a good logical <br />intelligence and has been interested in Mathematics will greatly affect the learning achievement in SMA Depok municipality</p>