How to Calculate Quickly ( The Art of Calculation )

Calculate Quickly ( The Art of Calculation ) by. Henry Sticker In this book you will learn the art of Addition, Substation, Multiplication, and etc. The whole new techniques are used to calculate mathematical numbers in less than a second. By reading this book you will be able to amaze your teacher, friends, and relatives.  How to Calculate Quickly - Full Course in Speed Arithmetic Publisher: Dover Publications Henry...

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