GEOMETRY AND MEASUREMENT CONTENT KNOWLEDGE OF PRESERVICE K-­‐8 MATHEMATICS TEACHERS: A SYNTHESIS OF RESEARCH Dr. Christine Browning and A.J. Edson In this paper, we summarize the findings of a research synthesis specifically related to the geometry and measurement content knowledge of elementary/middle school preservice teachers. Findings from this synthesis show that preservice teachers have weak conceptions in geometry and measurement content knowledge. However, instructional strategies that incorporate technology (e.g., dynamic geometry software or virtual manipulatives) or analyzing children’s work, have been shown to strengthen preservice teachers’ understanding.