![]() One is called Russian Peasant Multiplication. There are many other multiplication algorithms. Use the lattice method to work the following multiplications. From there, go down a diagonal until you get to the answer. ![]() Go vertically and horizontally from where the two decimal points originate, until the two lines intersect. The product will then be at the bottom of the lattice.Ĭan you find the six products shown with this method in the lattice above? Do you see how the lattice takes care of multiplying by 1, 10, and 100? To get the product of the two numbers, add the numbers in each slanted column, carrying digits, if necessary. Multiply each pair of digits, placing the result in the two triangles. Use this lesson as a standalone or as a prelesson to. Each pair of digits, one from each number, corresponds to a square made up of two triangles. Enhance your students multiplication toolbox by teaching them the lattice strategy for multiplication. Place the digits of the first number across the top and the digits of the second number down the right hand side. Draw the diagonal lines so that your squares are cut in half. Next, draw horizontal lines, one more than the number of digits in the second number. The method is more visual than the method we use today, and it is currently often taught in schools.ĭraw vertical lines, one more than the combined number of digits in the two numbers. ![]() The Italian term for the method is gelosia, namely, the metal grille or grating (lattice) for a window. David Eugene Smith, an American mathematics education historian, asserted that it was brought to Italy from the Middle East. It can be found in early Arabic, European, and Chinese mathematics. According to Wikipedia, it is not known where it arose first, nor whether it developed independently in more than one region of the world. It has been used historically in many different cultures. In this unit we will learn a method for performing multiplication of whole numbers that was used in the past.
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