<![CDATA[The background of the research is the learning devices, lesson plan and teaching material, used by students in learning is not related to the student real life. The proposed solution is the developing of math learning devices on the material of Alam Takambang Jadi Guru-based Linear Program. The development aims to know the validity and practice of learning devices. The type of the research is development. The research uses 4-D model that consists of 4 stages, i.e. defining stage, designing stage, developing stage and disseminating stage. The research is only conducted into the third stage i.e. developing stage. The validity and practice are conducted on the developing stage. The validity test result of student work sheet (LKS) and lesson plan by validator are 3.84 and 3.98 and it shows that LKS is in a very valid criteria. The student practical test result is 84.74%, while the teacher practical test result of lesson plan and LKS are 95% and 95.45%. It can be concluded that the math learning devices on the material of Alam Takambang Jadi Guru-based Linear Program is valid and practical.]]>
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