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This study aims to produce a valid mathematics learning devices for class VII junior high school. The developed devices are learning plan and student’s worksheets based on M-APOS approach. The development model used in this research is a Plomp model consisting of 3 phases, that is preliminary research, prototyping stage, and assessment stage. But the focus of this research is prototype development stage that is in stage of validity by expert. Aspects assessed at the validation stage are aspects of language, aspects of presentation/didactic, content aspects, and aspects of graffiti. The final result of this research is to produce a valid mathematics learning device based on M-APOS. Keywords—Validation, Learning Devices, M-APOS Theory

Validity of Mathematics Learning Devices Based on M-APOS Theory to Improve The Problem Solving Ability of Students Class VII Junior High School