“…2551, (3) to study the concepts, principles, and theories related to the Development of teaching activities application according to an AR game activity on Mathematics subject in addition and subtraction of numbers up to a hundred thousand for learning disabilities primary 4 students, (4) analysis of content, structure, and guidelines for teaching and learning management, (5) determine the main objectives of the research, (6) formulate the structure of the teaching activity application according to an AR game activity on Mathematics subject in addition and subtraction of numbers up to a hundred thousand for learning disabilities primary 4 students, ( 7) make an application according to the structure of the content defined by adhering to the core curriculum for learning the an AR game activity on Mathematics subject in addition and subtraction of numbers up to a hundred thousand for learning disabilities primary 4 students, (8) make a test and the satisfaction assessment form of grade 4 students towards the teaching activity application according to an AR game activity on Mathematics subject in addition and subtraction of numbers up to a hundred thousand for learning disabilities primary 4 students to use as a research tool, (9) bring the application created by the researcher to the experts for review. To find the consistency between the content, language used, questions, teaching and learning activities to create and find the effectiveness of the tool with three measurement and evaluation experts, and then use it to improve and correct errors to be utterly correct as experts recommend in all respects, (10) bring the application to demonstrate how to use it with students in schools other than the sample group, to determine the performance of the application and make improvements until the efficiency is acceptable, (11) bring the application to demonstrate how to use it with a sample group, namely primary 4 students at Wat Pathum Nayok School. Under the Office of Pathum Thani Primary Education Area 2, 9 people to determine the efficiency of the application, E1/E2 was determined to equal 80/80.…”