Mental Arithmetic 125×56

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Jun 26, 2011 21:10
Although I am not sure how it will be useful in the future, this kind of training is popular among the top schoolchildren in Japan. They quickly do multiplications in their head.


Once you learn the method, it is not difficult. However, even if a schoolchild figures out the method on his own, he is perhaps inferior to Gauss, to say nothing of those who are simply taught it by teachers.