Come learn how to nurture young children’s development of mathematical vocabulary that helps them acquire the appropriate terms as they build an understanding of the math concepts represented by them. Attendees participate in activities from Project M-square, a National Science Foundation-funded research-based project developing advanced geometry and measurement units for primary students. Participants view kindergarten video of young student mathematicians as they learn math vocabulary words that express their growing understanding of advanced concepts and analyze written work. A multitude of strategies that can be used to support your own students’ mathematical language are shared.