#LATTICE METHOD MULTIPLICATION HOW TO#

Your answer is the number outside of the grid. Write the answer in the space outside the grid. Be careful not to use these numbers in the next step! 4 2 9 1 8 3 6įinally, you need to ADD the numbers inside the grid along the diagonals.

Now, you’re finished with the numbers 42 and 9. *If there are no tens or no ones in the product, don’t forget to put a 0! 4 2 9 1 8 3 6 The digit in the ones place of the product goes to the right of the diagonal. The digit in the tens place of the product goes to the left of the diagonal. Then, multiply the number on the top of each column with the number to the right of that row. Put the 2-digit number across the top of your grid and the 1-digit number on the right side of your grid. The line should go past the lower left hand corner to the outside of your grid. Next, in each box, you need to draw a diagonal line from the upper right hand corner through the lower left hand corner. Let’s start with a 2-digit by 1-digit example… If you want to multiply: 42 x 9 First, you have to make a 2 by 1 grid (because it’s a 2-digit by 1-digit problem) What is lattice multiplication and when would we use it? Lattice multiplication is a way to multiply larger numbers (bigger than a 1-digit number times another 1-digit number) You can use lattice multiplication with any big multiplication problem as long as you can draw a big enough grid!

#LATTICE METHOD MULTIPLICATION HOW TO#

How to do: Lattice Multiplication Created by Lilian Patrick 2009

Lattice method multiplication