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The purposes of this study were 1) to construct instructional activity package on relations and functions by using a graphing calculator for Mathayomsuksa students in order to attain the efficiency index of 80/80, 2) to study the Mathayomsuksa students’ achievement on relations and functions by using a graphing calculator and 3) to study the students’ satisfaction toward instructional activity package. The study was conducted during the second semester of the 2017 academic year with grade 9 of Mathayomsuksa students at Princess Chulabhorn’s College Lopburi School. The experiment group with 24 students was using purposive random sampling approach. The researcher taught the group for 26 periods of 50 minutes each. Sub-test and final achievement on relations and functions test were used in assessment of the students’ performance. Moreover, the experiment group was given a questionnaire to measure his/her satisfaction toward instructional activity package. Result of the study were as follows: (1) The effectiveness of the instructional activity package on relations and functions by using a graphing calculator for Mathayomsuksa students was 70.25/70.66 which lower than the criteria of 80/80. (2) More than 60% of the experimental group passed the Instructional Activity Package at 0.05 level of significant. This showed that the Mathayomsuksa students had ability to learn on relations and functions by the Instructional Activity Package that was designed by the researcher. 3) The satisfaction of experimental group toward the Instructional Activity Package on Relations and Functions by Using a Graphing Calculator was at high level.
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