Uplift K12 is a teaching platform that builds foundational fluency in math through active participation, live peer collaboration, and formative assessment. The new tool substitutes concrete manipulatives, such as wooden or plastic blocks, for virtual manipulatives, bringing the highly effective CRA (Concrete-Representational-Abstract) methodology into the virtual classroom. Anonymous data of student performance, keyboard clicks, and mouse movements are collected and stored for researchers to access for free.