We will see how to multiply a number by a two-digits number.
1. Write the numbers
You first write the numbers in a drawing like this.
2. Multiply the first number by the units of the second number
You find a large number under the line.
3. Write a zero
Write a zero under the number you found out at step 2.
4. Multiply the first number by the tens of the second number
Write the result left of zero
5. Add the two numbers
Add the two numbers you found out at step 2 and 4.