This research aims to: (1) to create and develop training skills, math, stories multiplying instructional learning math, grade 5, 1 booklet, effective criteria 75/75 (2) to compare achievement before and after training the mathematical skill stories multiply, instructional math grade 5 (3) to study the students ' satisfaction with the learning activities by training the mathematical skills. The story of multiplying instructional math grade 5 The sample in this research include students grade 5-semester 1 academic year the school ban Nong ya Plong 2559 (2016) Amphoe mueang Chaiyaphum District Office of Chaiyaphum district primary education 1, a total of 25 people have come by to select the sample group (Cluster Random sampling), a tool used in the research include training the mathematical skill matters. Multiplication math learning citizenship grade 5 to 9 books number 1 test series achievement before and after study. The story is a multiplication answer a multiple-choice option 10-7, the number of queries, the satisfaction of students to use math skills matter training. Multiplying the citizenship grade 5 math 20 stats that are used in the data analysis include the average percent t-test, and the standard deviation. Find out the effectiveness of training the mathematical skill as a benchmark 75/75 by using the formula of E1/E2 difference between test scores before and after classes using t-test. The study found that 1. create and find out the effectiveness of training skills, math, stories multiplying instructional math grade 5 1 books found to be as effective with 75.30/78.57 which is higher than the benchmark set is 75/75. 2. educational achievement before and after training the mathematical skill stories multiply, instructional math grade 5 high school before studying at the .05 level significantly. 3. the results of the study of student satisfaction with the learning activities by training the mathematical skills. The story of an average multiplier () is equal to 4.40 standard deviation (S.D.) equal to 0.93 is in very satisfactory.
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