The purpose of this research is to develop the skills to solve mathematical problems on solving problems by using the set of positive teaching of grade 5 was used during the research. Students 5 / 2 Creek School House was painted, Chaiyaphum Province, during the 1 academic year 2559 number 1 classrooms were 30 people. Which is derived from the random sampling method. Instruments used in this study is the teaching of problem solving addition of grade 5 number 4 series and a handbook for teaching use And the achievement test. Before and after the instruction. About problem solving addition of grade 5 constructed a multiple-choice item number 30 model 4 options. Data were analyzed by software. By finding the mean, standard deviation, the efficiency of teaching by using E_1 / E_2. And the test values (T - Test) findings.