Results of the research appear as follows:(1) the training of mathematics, inequality matters skills high school year 12 sets of 3, all studies are created equal effective 78.15/77.22. That is, which is higher than the defined criteria. (2) the subject mathematics achievement inequality of student 3rd year high school who received training from the training set after learning the 12 skills higher than before the study significant statistical .01 level. Research studies Mrs. Lakkhana phityakhom Supanya school udonthani Educational area offices of Udon Thani District 1
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