In this lesson we will explain how to multiply a multi-digit number by a one-digit number.
You have to write the numbers in a drawing like this.
You first write the multi-digit number at the top, then you write the one-digit number under the units of the number at the top.
You multiply the one-digit number by the Units of the top number.
If the result has only one digit (example : 3×2=6) it is an easy multiplication.
In such a case you write the result under the line, under the one-digit number.
You multiply the one-digit number by the tens of the top number.
If the result has only one digit you write it under the line, at the left of the number you found out at step 2.
You do the same with the hundreds of the top number, with the thousands...
When there are no more digit to multiply you can read the final result of the multiplication under the line.