This session examines the research-based progression of number sense skills outlined in numerous state and national early childhood standards designed to support deeper knowledge of the number system. Participants will examine video-taped examples of children progressing through this continuum and engage in small and large group discussions supported by lecture with research documentation to more clearly understand how these skills unfold in problem-solving scenarios embedded within teacher-guided instruction and play-based inquiry. The presenter will share hands-on activities appropriate for scaffolding, play, and practice centers.