Write the numbers one above the other, aligned by place value
Multiply each digit of the bottom number by each digit of the top number
Write each partial product in a new line
Shift each new partial product one place left for each step to the left in the bottom number
Add all partial products together
Carry over when a product is 10 or more
Keep place values aligned while adding
Use zeros as placeholders when needed
Check the final answer for alignment and carries
For very large numbers, use a calculator or long multiplication method