Although the lattice method for multiplication is no longer being used right now in school, it is easy understand

I will illustrate with two good examples. Study them carefully and follow the steps exactly as shown

Multiply 42 and 35

Arrange 42 and 35 around a 2 × 2 grid as shown below:

Notice that 3 is located in the first row and 4 in the first column. That is why the answer goes in the intersection.

By the same token, multiply 5 and 2 and put the answer in the intersection of second row and the second column

And so forth...

The first diagonal has only 0. Bring zero down.

The second diagonal has 6, 1, 0. Add these numbers to get 7 and bring it down.

And so forth...

Multiply 658 and 47

Arrange 657 and 47 around a 3 × 2 grid as shown below:

The first diagonal has only 6. Bring 6 down.

The second diagonal has 2, 5, and 5. Add these numbers to get 12. Bring 2 down and carry the 1 over to the next diagonal.

The third diagonal has 3, 0, 3, and 2. Add these numbers to get 8 and add 1 (your carry) to 8 to get 9.

and so forth...

I understand that this may be your first encounter with the lattice method for multiplication. It may seem that it is tough. Just practice with other examples and you will be fine.

Any questions about the lattice method for multiplication? Just contact me