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The abacus is one of the oldest and most reliable mathematical tools available to humankind. The Amazing Abacus Addition and Subtraction allows children to access this tool in a colorful and easily used manner. This is one of the best ways for children to visually understand advanced math concepts like addition, subtraction, multiplication, and division. There are various rows for children to experiment with, with different powers of ten. Watch as they fall in love with math!