Best for accelerated learning of the two-hand system of Abacus Arithmetic and Mental Arithmetric.
The process of developing other aspects of the mind. When the children have acquired an astonishing calculation speed, it is actually only the end result of having developed the following mental abilities:
Best for accelerated learning of the two-hand system of Abacus Arithmetic and Mental Arithmetric.
The process of developing other aspects of the mind. When the children have acquired an astonishing calculation speed, it is actually only the end result of having developed the following mental abilities: