ABSTRACT This research is to know effect of study model cooperative type is two stay two stray (TSTS) and strategy metacognitif solution problem with strategy metacognitif reasoning for again skill student. Use this methode design eksperimen treatment by design 2x2. This population all students in SMA Negeri 2 bekasi. This sample is students class of XI IPA I and XI IPA 2. There are 34 student…