The Number Sense materials develops number sense with whole numbers. Number sense is the ability to break down and recombine numbers in useful ways, based on a conceptual understanding of how numbers work. Developing number sense can help beginning learners improve their mathematical fluency without memorization as well as build a solid foundation for later study. Most of the activities in each unit work best when done synchronously (whether in person or online), but the routines, once established, could be assigned for homework.
English versions last updated in 2025. Spanish versions last updated 2023.