Lattice method

It helps organize carrying during multiplication.

It requires memorizing multiplication tables up to 12x12.

It makes division problems easier.

It eliminates the need for basic multiplication facts.

Set Up

Multiply

Slide

Place Numbers

4 and 2 above, 6 on the right

6 above, 4 and 2 on the right

42 above, 6 on the right

2 above, 4 and 6 on the right

Tens go in the top triangle

Ones go in the bottom triangle

Ones go in the top triangle

Tens go in the bottom triangle

2

5

7

9

Reading the answer from the top-left and going around the corner

Adding the outside numbers to the total

Multiplying each digit and placing the results in the boxes

Ignoring the original problem numbers on the outside

Because the outside numbers are only used to set up the problem, not for calculation.

Because the outside numbers are always zero.

Because the outside numbers represent the answer.

Because the outside numbers are used for addition, not multiplication.