1. Lattice Multiplication A NEW way to Multiply
By: Mrs. Overley
4th Grade Math Teacher

2. Lattice Multiplication
Directions!!!!!!
First Look your problem.
Determine the number of digits in the first factor. (The numbers on the Top)
Then determine the number of digits in the second factor. (The numbers on the Bottom)
Now construct (draw) a big box and divide it to where you have the same number of squares needed for the number of digits located in the top and bottom factors. See left. 36
X 28

3. 36 X 28 Lattice Multiplication
Now divide each of the smaller boxes in half.
Like below. 36
X 28

4. Lattice Multiplication
Now, write the first factor across the top and the second factor down the side. 36
X 28

5. 36 X 28 Lattice Multiplication
Now begin to multiply the first factors together, the tens digit goes in the top half of the box and the ones digit goes in the bottom half.
Lattice Multiplication 36
X 28

6. 36 X 28 Lattice Multiplication
Now continue multiplying. (If the answer is a single digit, such as 6, then place a 0 in the top half the box and write a 6 in the bottom half.)
Lattice Multiplication 36
X 28

7. 36 X 28 Lattice Multiplication
Now add each of the columns diagonally. Regroup when necessary.
Follow the same steps for 3-digit by 2-digit numbers! (Or can be used with any multiplication problem!)
Lattice Multiplication 36
X 28