This study aimed to describe the effectiveness of problem posing and problem solving approach, and to compare the effectiveness between problem posing and problem solving approach in terms of attitude toward Calculus and learning achievement. This study was a quasi-experimental study using the pretest-posttest non-equivalent comparison group design. The population of this study were student of Musamus University. The sample in this study were 2nd semester students of mathematics educations departement who were divided into two groups. To assess the effectiveness of the problem posing and problem solving approach, the one sample t-test was carried out and to determine the more effective approach, independent sample t-test was used. The results of this study show that (1) the problem posing approach was effective in terms of attitude towards Calculus and learning achievement; (2) problem solving approach was effective in terms of learning achievement; and (3) problem posing approach was more effective than problem solving approach in terms of students attitude toward calculus.