This is a great resource for any Montessori classroom as well as any home school that applies the Montessori method to math instruction. The idea behind this book was to bridge the gap between the abstract and the concrete. Children who are comfortable working with the golden beads to solve complex addition problems can work on them in a more abstract way. Both static and dynamic (regrouping) addition are included. "Take home beads" are also included for children to use as a suppemental resource at home when working with more complex numbers.