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ULTIMATE (Understanding Learning Trajectories In Math: Advancing Teacher Education) is a new research project that will support teachers in deepening their understanding of how children learn mathematics and how to incorporate this understanding into their classrooms to help children develop math ideas and skills—joyfully. Over two decades, we have built a professional development tool, now called Learning and Teaching with Learning Trajectories, or [LT]2. The research team worked with teachers, blending high quality in-person professional development with teachers' use of the [LT]2 tool. The team is investigating the impacts on teachers (results presented here), and on students..