This study aimed to develop a computerized instructional program and to investigate the effects of the teaching method (Computer-Based Instructional program; Traditional Instructional Methods) on the achievement of the 5th grade students in the social and national subject in Jordan. A random sample of (161) male and female students from the 5th grade level were divided into four groups and assigned to two separate teaching methods. There is a control group which has (36) male and (45) female students, and there is an experimental group which has (38) male and (42) female students. The experimental group was taught by using the computer based instructional program, while the control group was taught by the traditional instructional method. The results of ANCOVA showed statistically significant differences between the achievement of the 5th grade students due to the teaching method, in favor of the Computer-Based Instructional Program. The results also showed that there were significant differences between the achievement of the 5th grade students due to the sex variable in favor of the females. However, the study didn\'t show any statistical significant differences on the achievement of the students due to the interaction between the method of teaching and the gender variables. So, the researchers recommended expanding the computer use in teaching the social and national educational curriculum.