Development of applications to practice math skills on a computer Tablet for students: grade 1 has been working with applications to practice math skills on a computer tablet development has completed a trial to test groups with students.Ongphuea find out the effectiveness of tools to collect information from skill-training applications to experimental groups. Bring out the performance of the machine, with data analysis, statistical analysis and application to practice math skills on a computer Tablet has been successfully modified to apply to groups of students, for example. This process of working is to test students before school and collecting information from the test subject to subtract numbers. Then students Learning process sum from applications to practice math skills (positive and negative numbers on a computer Tablet for students at grade 1) when the study is finished, the students perform the tests after studying and collecting information from the test tools used in the check box.Featured Research consists of Application to practice math skills are the quality of the assessment of the application of a mathematical skills training and a test measuring achievement. The results showed that the overall assessment of the technical content is 3 design applications and the measurement and evaluation. An overview of all aspects of quality, there is a very good level of average equivalent to 4.79 and learning achievement before the latter study with applications that score higher learning after school. The statistical significance level 0.01 indicate that applications developed can be applied to teaching and learning effectively.