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If someone can calculate with an abacus slide rule, they are faster than with a calculator and they are able to calculate large numbers in their head "purely intellectual".

Math teacher calculates with abacus
In short:

On this page you can use a full virtual European version of the abacus.
Quick manual
To use the virtual abacus slide, simply click on the orbs to move them.

You can find a detailed user manual for the tool under the tab Instructions.

A guide to calculating with the abacus can be found under the tab Information.
Um den Abakus-Rechner zu sehen benötigen sie JavaScript

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