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Eng.Inventor / Shahat Said EL Saied Abou Zekry

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Book of mathematics arithmetic's on fingers to find all solutions of calculation, such as, addition, Subtraction, multiplication, dividing and revision very easy

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If you are like the conversion all vehicles engines to run by water instead petrol fuel, diesel fuel or natural gas fuel.

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If you are like the mathematics arithmetics and you want to refresh your memory, your omnipotence and learn how you can solution all the mathematics arithmetics on your fingers and revision it, so that the multiplication operations on your fingers only, faster and accurate from the calculator machines and without it.

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