This study investigates the relationship between self-confidence and mathematic achievement among students on grad 6th in Southern Thailand. This study conducted by quasi-experimental research design used cooperative learning by STAD technique. A sample of 72 primary school students (36 treatment group; 36 control group) was employed for this intervention study. The attitude toward mathematic inventory (ATMI) was employed over 15 weeks. The result found that cooperative learning by STAD technique improving students' self- confidence in mathematic class. The student's studies in a small group have to interact with each other in the group and each member has their role to play in the group to improve their social interaction.
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