<p>This research is aimed to acknowledging  the impacts of previous ablity  on the result of learning mathematics . Previous ability in this research is students’ basic  ability of mathematics. The  research is corrasional survey  with simple regression analysis on the students X grade at SMK Negeri 2 Cikarang Barat. Sample in the research is 50 respondents taken from the number of population reach as many as 481 respondents. The instrument used is written test in the form of multiple choice and essay. the data was analyzed descriptively and inferensial after the data fulfill normality test and linnearity test and the result show that t_count &gt; t_table (4.426 &gt; 2.001). So it can be concluded that in 50 % significancy, there are significant impacts of previous ability on the result of learning mathematics.<strong></strong></p>