COME FARE CALCOLI A MENTE VELOCEMENTE esercizio utile anche per la lettura e la concentrazione HOW TO DO MENTAL CALCULATIONS QUICKLY Exercise useful also for reading and concentration Paolo Fabiani Il video tutorial è disponibile al seguente indirizzo web su YouTube: https://www.youtube.com/watch?v=C508elmyEnA As soon as possible I will put the subtitles in English. However, in the exercise that you can see in the video, I perform the sum of 10 numbers in about two seconds. This video is freely available (in Italian) on the YouTube platform to the following URL: https://www.youtube.com/watch?v=C508elmyEnA