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Chapter 222 Yun Niang's Calculation
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... e, he would silently play number games in his heart.
Zhao Zhitong told him that this is called a mental arithmetic game, and he can play it alone in his mind in his spare time, which can make people smarter.
Later, even the little cousins and sisters of my grandpa’s family started to play this game.
After training in this way, it is obvious that the children in the family have become more or less smart.
—
On this day, Zhao Zhitong received a letter ...
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