Write the numbers in columns, aligning place values
Multiply the top number by the ones digit of the bottom number
Write down the result, carrying if needed
Multiply the top number by the tens digit of the bottom number
Shift this result one place to the left
Write down the result, carrying if needed
Multiply the top number by the hundreds digit of the bottom number
Shift this result two places to the left
Write down the result, carrying if needed
Add all partial products together
Write the final answer