This research aimed to produce Lower Secondary Mathematics Teaching Materials with the Scientific Approach Oriented to Problem Solving Ability including Lesson Plan (RPP), Student Working Sheet (LKS), and a valid, practical and effective student Learning Achievement Test (TPB). This type of research was a research and development method. The development model referred to was to use a 4-D development model consisting of four stages: define, design, develop, and disseminate. The research instruments used were validation sheets, teacher practicality sheets, student practicality sheets, learning implementation observation sheets, and Learning Achievement Tests. The results showed that the development products are included in very valid categories according to experts, very practical according to the teacher's assessment, and practical according to students and the results of learning achievement tests meet the effective category.