Description
A grid is drawn up, and each box is split diagonally. The first and second numbers are positioned along the top and right of the lattice respectively, with each digit being above a column, or next to a row. Simple products are written in each box, corresponding with numbers along the top and to the right of each box. For example, if the number above the box is 3, and the number to the right is 6, (for 18) will be written in the box. If the simple product lacks a tens place, simply fill in the tens place with a 0.
After all the boxes are filled in this manner, the diagonals are added from right to left, bottom to top, with the numbers added and written where the diagonal leads. When the sum contains more than one digit, the value of the tens place is carried over up to the next diagonal. 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 (on the bottom).
Read more about this topic: Lattice Multiplication
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