Building number sense creates a strong foundation for further learning in Math. These folders are visual representations of important concepts that will help your students to build that strong number sense foundation. Math Build-a-Folders is the perfect reference for your developing mathematicians.How to Use This Resourcecreate a folder for each student with the visuals they need (Numbers to 10, numbers to 20, numbers to 100, 120)design a set of general number sense folders that can be used ove