Draw an extended diagonal through each box from upper right corner to lower left corner. Example: 35625 356 3 digits 25 2 digits 3x2 3 digits 3 columns 2 digits 2 rows. To get the answer, add the entries in each diagonal, carrying tens digits over to the next diagonal if necessary. Draw a grid that has as many rows and columns as the multiplicand and the multiplier. (If the product is a one digit answer, place a 0 in the tens place.) It breaks the multiplication into steps using a lattice, or grid. Write the digits of the first number along the right side of the grid and the digits of the second number along the top.ĭivide each cell of the grid diagonally and write in the product of the column digit and row digit of that cell, separating the tens from the units across the diagonal of that cell. Lattice multiplication is a way to multiply large numbers. Although the lattice multiplication strategy eliminates regrouping while solving the problem, it r. Since we are focusing on multiplying two-digit numbers we need to create a box and divide it into four smaller boxes by drawing a line horizontally and vertically. This video demonstrates how to use lattice multiplication. Now, adding the digits along the diagonals as shown in below figure, Finally add the simplified digits from left to bottom in order to get the product as shown. You create this by creating a box and dividing it into smaller boxes. The first step is you have to have the lattice built. To multiply 43 and 218, for example, draw a 2 × 3 grid of squares. Lattice Multiplication Step By Step: Step 1. Step 5: The last step is to rewrite the answer to the problem by adding a 1 to any digit that is underlined. Since 7 + 8 15, write the 5 under that column and underline the digit to the left ( 5 ). Lattice multiplication is a unique method of multiplication that is easy to use and provides a visual aid for students to understand the concept. In the 1500s in England, students were taught to compute multiplication using following galley method, now more commonly known as the lattice method. Step 4: Add the digits in the next column to the right. Also, show a picture of a lattice so that students can see the relationship between the pattern of a lattice used for gardening, and the pattern of the lattice used for multiplication. Students can look the word up in a dictionary. Can you adapt the method to compute 102 × 3054? (Why is some adaptation necessary?) Ask the students why this method might be called lattice multiplication.
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