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The purposes of this research were 1) to develop of learning activities using Problem-Based Learning Base on STEM Education on Geometic Transformation Application for grade 8 students to be required efficiency and 2) to study the effective index of the learning activities using Problem-Based-Learning base on STEM Education in Geometry Transformation Application for grade 8 students. The research sample consisted of 57 volunteer students of grade 8 in Takhliprachasan School, Nakhon Sawan Province, which is conducted by using Quasi - experimental research method. The research instruments were the learning activities and mathematical learning achievement test. The data were analyzed by mean, percentage and standard deviation. The results showed 1) The learning activities plans using Problem-Based-Learning base on STEM Education on Geometry Transformation Application for grade 8 students had effectively of 85.95/82.86 and 2) The effective index of learning activities using Problem-Based-Learning Base on STEM Education on Geometry Transformation Application for grade 8 students was 0.67.
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