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Addition・Subtraction (Method of Instinctive Calculation)---Now on special sale !-----Without using f

available(Free app) : A part of the flash cards or step game. Without using fingers, you will be abl

Multiplication・Division(Method of Instinctive Calculation)----Now on special sale !----Without using

available(Free app) : A part of the flash cards or step game.Without using fingers, you will be able