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In order to obtain powerful ultra-high-speed computing power! Mental arithmetic! How to train the means to achieve the goal! Teach!
Read these two books carefully: Fast Calculation, one of which was written by Liu Hou.

Magic Mathematics in Life: arthur benjamin, the simplest mental arithmetic in the world.

Understanding and practicing according to the methods in the book for a period of time can make you like mental arithmetic and make you an expert in mental arithmetic.

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