This study aims to determine whether there is a positive and significant influence between student interest in learning and student achievement and whether there is a positive and significant influence between social interaction in the family and student interest in learning together with student achievement. The population in this study were seventh-grade students of one of the schools in Semarang. The sample of this study amounted to 139 students, determined based on the Krecjie table with an error rate of 5%—sampling technique using a random sampling technique. The data analysis used is descriptive and quantitative. Based on descriptive analysis, students' interest in learning mathematics is classified in the sufficient category with a percentage of 56.84%. Students' math learning achievement is classified in the moderate category with a percentage of 36.69%. The results of quantitative analysis of student learning interest variables on student learning achievement show a correlation coefficient of 0.825 (t count = 16.995 with sig <0.05) so it can be said to be significant, meaning that the second hypothesis is accepted, a positive and significant influence between student learning interest on student learning achievement effective contribution of 68.06%.