You may have to use long multiplication to figure out how much tax will cost on an item, or the cost of gas for your car.Ĭontinue on to the Got It? section to work on a worksheet. The important thing is that you find a method that works best for you, because multiplication is used every day! Al-Khwarizmi is also credited with being one of the founders of modern algebra. It does not matter what method you use to solve multiplication problems. The lattice method of multiplication dates back to the 9th century when the Persion mathematician, Al-Khwarizmi, first mentioned it in his revolutionary writings on math called 'The Compendious Book on Calculation by Completion and Balancing'.
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