Multiplication

Long Multiplication

Long Multiplication is a special method for multiplying larger numbers.

It is a way to multiply numbers larger than 10 that only needs your knowledge of the ten times Multiplication Table.

Let us say we want to multiply

612 × 24

• First we multiply 612 × 4 (=2,448),
• then we multiply 612 × 20 (=12,240),
• and last we add them together (2,448+12,240=14,688).

But we can do better!

When we multiply 612 × 20 we only need to multiply 612 × 2 and place the result one column over (so it is the same as multiplying by 20).

We just have to be careful about lining up the columns.