This study aims to determine the differences of critical thinking skills and motivation to learn through the assignment of structured and independent tasks on students of class VIII-9 and VIII-10 MTsN 2 Makassar On Motion System Material In Humans. The design of this research is experimental research (quasi experiment). Population and sample are students of class VIII-9 and VIII-10 MTsN 2 Makassar Lesson 2017-2018. Data collected in the form of critical thinking skills tests and motivation test learning. The data obtained were analyzed descriptively and inferentially by describing the mean, standard deviation, and percentage whereas the inferential analysis was used to test the hypothesis through t-test and before the first t-test was tested normality test and homogeneity of variance. The result of the research shows that there is significant difference of critical thinking ability between experimental class of structured task and experimental class of independent duty, as evidenced by the data tcount (5,31).Where based on the test criteria it can be said that H0is rejected because the value of t count is greater than the value of ttable(1.67). There is a difference in learning motivation between the experimental class of structured tasks and the experimental class of independent tasks, as evidenced by the value of learning motivation of structured task (3.37) lower than the self-learning task motivation (3.54), and tcount(1.70). Where based on the test criteria it can be said that H0is rejected because the value of t count is greater than the value of ttable(1.67).