The Montessori method uses Colored Bead Stairs and Golden Bead Materials to visually represent the quantity of a number and how those numbers interact with each other. The beads can also be used to visualize and physically complete addition, subtraction, and multiplication.

A box (with compartments and lid) containing 20 of each colored bead bar 1 thru 9.
These beads along with the tile material are component parts necessary to do the Checker Board activities - view on Amazon

45 Golden Bead Bars of 10 with Box - view on Amazon