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--This research is research of development by using modified Plomp model, without including implementation phase. The device developed is RPP and LKPD. However, in this paper only focused on the validation test process through test validation constructs , language and content on the development of the device created. The end result of this research is to produce a valid learning device development

Analysis Validation of Math Learning Devices Based on Guided Discovery Method to Improve Problem-Solving Ability of Grade VII Students of Junior High School