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In Paris, the Exposition Universelle of 1889 has opened its doors.

Close to the Eiffel Tower, which has just been inaugurated, people are gathering in the gallery of machines: Professor Barnabé Barberac going to present his new invention ...

Challenge the Professor, defeat his machine with the speed of your thinking and your mental mathematics skills!


The Challenge for schoolkids
You have the best score in the world
The mental math game




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