Montessori Math: Add & Subtract Large Numbers

Designed by teachers and Award winning app developers, Montessori Math: Add & Subtract Large Numbers presents an in-depth, step-by-step approach to these two essential operations. It also presents fundamental Montessori materials: the stamp game and the bead frame. More importantly, this app makes the concepts of “exchanging” (carrying/borrowing) so obvious that even adults will be surprise…