The Abacus is a tool for the addition and subtraction of numbers.

Mental Arithmetic Duel

Head arithmetic is especially important when you have no calculator at the moment.

Leonardo da Vincis (1452-1519) Eternity Machine

How long does it take until the last gear wheel is moving for one cog?

Pizza Oven

Fraction calculation in daily version. Different sized pizza slices are waiting in the pizza oven, to be reassembled on the plate.

Calculation Task-Scale

In this exhibit equations can be visualised with a scale.


This is a playable method for kids to learn the multiplication tables. The different regularly stars give the opportunity for self-control.