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The objectives of this research were 1) to develop and quality finding of an activity package on equation and equation solving for Prathomsuksa 6, 2) to determine the efficiency and the effectiveness index of the activity package on equation and equation solving developed for Prathomsuksa 6, 3) to compare the learning achievement of Prathomsuksa 6 students’ between before and after learning through the activity package on equation and equation solving that had been developed, and 4) to study satisfaction of Prathomsuksa 6 students using activity package on equation and equation solving. The target groups of this research were 50 prathomsuksa 6 students who were studying equation and equation solving in the second semester of the academic year 2014 from four schools in Educational Fund Project, Lopburi Province gained by purposive sampling. The research instruments were 1) an activity package, 2) activity plan, and 3) achievement test with the reliability of 0.89. Data were analyzed in form percentage, mean, standard deviation, and t-test. The findings showed that:
1. The activity package of 13 activities on equation and equation solving for Prathomsuksa 6 included four units as in unit 1: basic equation, unit2: properties of equality, unit3: equation solving, and unit4: equation problems. The quality finding of the activity package was 4.84.
2. The efficiency value of the developed activity package was 82.40/81.33.
3. The learning achievement of the posttest was higher than of the pretest at the statistical significant level of .01.
4. The satisfaction of Prathomsuksa 6 students using activity package on equation and equation solving was at the high level.
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