The Abacus Microworld is for representing numbers, even the not whole ones, in the positional decimal system.
In the Abacus Microworld it is possible to build the abacus, to decide how many rods will compose it, to produce cue balls on the rods, to execute sum and subtraction operations with beads, to change beads.

The representations realized in the Abacus Microworld can be copied to be pasted on the Solution Sheet.