The research is aimed. Is to study and compare student achievement
in mathematics. The students in the two classes divided by cooperative learning achievement (STAD) supplemented with STAR strategy towards mathematics achievement between pretest and posttest. The sample of students at the two schools Dung School District Dung, Udon Thani, the first class of 45 who were selected by random cluster (cluster random sampling) were used in this research include lesson plans Mathematics treasure. exponents of plan 9 achievement test in mathematics. Data were analyzed using mean, percentage, standard deviation. And Non-independent t test. The results were as follows:
1. Student achievement after learning about the 75 percent found that the students had an average score achievement after learning of 15.07 percent, 75.03 versus the 75 percent, results showed that achievement after school. not less than 75 per cent
2. achievement in mathematics pretest to posttest. Found that the students had an average score achievement pretest was 5.11 percent, 25.55, and achievement after learning of 15.07 percent, 75.03, compared with the test does not release results showed that achievement. after learning about higher learning.
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