# How to Do an Algorithm for Multiplication

## Transcript

Hi, my name is Stefan. Today, I'm going to speak on how to do an algorithm for multiplication. Whenever you are multiplying two numbers let's say 25 x 11 the first thing you want to do is you want to take out the decimal places so that's 10 to the negative 1, we move one place and on the bottom there's no decimal places to move so we're okay. And now what you want to do is start multiplying on the 1s place. In this case it's 1 x 25, 1 x 5 is 5, 1 x 2 is 2 and then you want to move onto the next place of course in this case, it's the 10s place, so you hold the place with a 0 and then you repeat the process of multiplying and we get 25 and then we move onto the next place now that we're done, we can begin to add. So we're done multiplying, now we're just adding and we get 5, 7 and 2 and now you want to reinsert the decimal place that you've taken out, and it's 10 to the -1 here. When we insert that, we get 27.5 and that's an algorithm for multiplication.

Stefan Robert is an expert in computers, with two degrees in both Computer Science and Applied Mathematics from the New Jersey Institute of Technology.