This film deals with the WHY’s, WHAT’s, and HOW’s of including rich, developmentally appropriate mathematics experiences for young children in Pre-Kindergarten classrooms:WHY? Research indicates the long lasting educational benefits young children take with them from positive introductions to key math concepts and ways of thinking quantitatively.WHAT? The film illustrates several “BIG ideas” that should be the focus of early math experiences as presented by experts from the Early Math Collaborative, formerly the Early Mathematics Education Project of Erikson Institute.HOW? Lively footage of five very different Pre-K classrooms demonstrates how foundational math can be joyful incorporated in both informal and planned activities.