Abacus - Wikipedia
![Abacus - Wikipedia](https://upload.wikimedia.org/wikipedia/commons/thumb/a/af/Abacus_%28PSF%29.png/220px-Abacus_%28PSF%29.png)
![](https://upload.wikimedia.org/wikipedia/commons/8/8a/Abacus_34437.jpg)
File:Abacus 34437.jpg - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/thumb/8/84/Suspended_lower_beads.jpg/174px-Suspended_lower_beads.jpg)
Abacus - Wikipedia
![](https://images.twinkl.co.uk/tw1n/image/private/t_630/u/ux/abacus-1866497-1920_ver_1.jpg)
What is Abacus Addition and Subtraction?
![](https://upload.wikimedia.org/wikipedia/commons/1/12/Abacus_architecture.gif)
Abacus (architecture) - Wikipedia
![](https://upload.wikimedia.org/wikipedia/commons/a/a4/Abacus_%28469411480%29.jpg)
File:Abacus (469411480).jpg - Wikipedia
![](https://www.wikihow.com/images/thumb/b/bd/Use-an-Abacus-Step-10-Version-4.jpg/v4-460px-Use-an-Abacus-Step-10-Version-4.jpg.webp)
How to Use an Abacus (with Pictures) - wikiHow
Abacus, Ro-Bots Inc. Wiki
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