Description: When dividing a whole number by a decimal, you're going to need to change that decimal into a whole number. How? We'll show you. Created by Sal Khan. So we're dividing this whole number by a decimal. Let me write a little bit bigger than that, since we have to do some work with it. So the first thing we do, since we have this decimal here, we're dividing by a decimal.*Teacher Advisor is 100% free.