Description: Sal uses arrays and repeated addition to multiply. Created by Sal Khan. If we have 2 groups and in each group I have 4, so that's one group of 4, and then here is my second group of 4, we already know that we could write this as 2 times 4, which is the same thing as 4 plus 4. Well, if I have 4 plus 4, or if I have 2 groups of 4, either way, I'm going to have a total of 8 things. What I want you to do is pause the video now and try to group these same 8 things, but to group it in other ways so that we can represent 8 as the product of whole numbers.*Teacher Advisor is 100% free.