We read the digits down the left side and then towards the right on the bottom to generate the final answer: 783996.Īlthough the process at first glance appears quite different from long multiplication, the lattice method is actually algorithmically equivalent. The final product is composed of the digits outside the lattice which were just calculated. What is the lattice multiplication method The lattice multiplication method uses a lattice to multiply two multi-digit numbers. We continue summing the groups of numbers between adjacent diagonals, and also between the top diagonal and the upper left corner. This Lattice Method Multiplication worksheet gives students a 2-digit by 2-digit multiplication problem and a lattice method grid for students to calculate the answer with an included answer sheet. We place the 9 just below theīottom of the lattice and carry the 1 into the sum for the next diagonal group. Next we sum the numbers between the previous diagonal and the next higher diagonal. We place the sum along the bottom of the lattice below the rightmost column. Since this is the only number below this diagonal, the first sum is 6. This number is bounded by the corner of the lattice and the first diagonal. We start at the bottom half of the lower right corner cell (6). We sum the numbers between every pair of diagonals and also between the first (and last) diagonal and the corresponding corner of the lattice. Now we are ready to calculate the digits of the product. If the product is less than 10, we enter a zero above the diagonal. The tens digit of the product is placed above the diagonal that passes through the cell, and the units digit is put below that diagonal. Now we calculate a product for each cell by multiplying the digit at the top of the column and the digit at the right of the row. īefore the actual multiplication can begin, lines must be drawn for every diagonal path in the lattice from upper right to lower left to bisect each cell. IllustratedĪbove is the lattice configuration for computing. Numbers are filled to the left and to the bottom of the grid, and the answer is the numbers read off down (on the left) and across. Ask students to turn to a partner and talk about when and where they have seen a lattice. Header for one row of cells (the most significant digit is put at the top). After all the cells are filled in this manner, the digits in each diagonal are summed, working from the bottom right diagonal to the top left. Introduction Show students the vocabulary card for lattice. Is placed along the right side of the lattice so that each digit is a (trailing) Of cells (the most significant digit is put at the left). Is placed along the top of the lattice so that each digit is the header for one column If we are multiplying an -digit number by an -digit number, the size of the lattice is. To multiply two numbers using the lattice method, make a table with the digits of the first factor along the top and the digits of the second factor down the. In this approach, a lattice is first constructed, sized to fit the numbersīeing multiplied. The lattice method is an alternative to long multiplication for numbers.
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