Virtual Math Manipulaataives, K-1

http://www.dreambox.com/teachertools
DreamBox Learning Teacher Tools include a variety of lessons using virtual manipulatives, ideas for incorporating the lessons in the classroom, and resources to support teachers’ professional development as they use the toolkit. The virtual manipulatives are Web-based tools that help students more easily grasp math concepts in visual terms. The lessons are designed to be successful in a wide range of classroom environments.