Chinese Abacus


+-----------------------------------------+
| *** *** *** *** *** *** *** *** *** *** |
| *** *** *** *** *** *** *** *** *** *** |
|  |   |   |   |   |   |   |   |   |   |  |
|--+---+---+---+---+---+---+---+---+---+--|
|  |   |   |   |   |   |   |   |   |   |  |
|  |   |   |   |   |   |   |   |   |   |  |
| *** *** *** *** *** *** *** *** *** *** |
| *** *** *** *** *** *** *** *** *** *** |
| *** *** *** *** *** *** *** *** *** *** |
| *** *** *** *** *** *** *** *** *** *** |
| *** *** *** *** *** *** *** *** *** *** |
+-----------------------------------------+

Type in a number, select "Add" or "Subtract", and then click on "Show Steps".
The abacus will then show you step by step the movements necessary to perform the addition or subtraction.

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