The Sonoma State University Department of Mathematics and Statistics presents Topaz Wiscons, Sacramento State University. Did you know that young learners can discover and explain many interesting mathematical concepts even before they learn formal algebra and common algorithms? We will explore multiple compelling approaches to mathematical sense making and I will highlight a current research project analyzing methods of representation used by pre-service elementary school teachers. Series supported by Instructionally-Related Activities Funds. For more information about this series, go to www.sonoma.edu/math