The data collection instruments used include the Student Monkey Sheet (LKS), end-of-cycle test questions, observation sheets for the application of the model, and field notes. With the following steps: 1) Planning, 2) Implementation, 3) Observation, 4) Reflection. The PTK model used is the Kemmis and Mc Taggart model, the researchers carried out research through two cycles, namely cycle I and cycle II. The type of research used is Classroom Action Research with quantitative and qualitative approaches. The purpose of this study is to determine the application of the Jigsaw learning model in improving learning achievement in thematic subjects of third grade mathematics at SD Anak Sholeh FULL DAY.
