Description: In simple addition we learned to add all the numbers together to get a sum. In algebra, numbers are sometimes attached to variables and we need to make sure that the variables are alike before we add the numbers. Let's say that I've got 2 Chuck Norrises, or maybe it's Chuck Norri. So I'm going to add another 3 Chuck Norrises. And this might seem a little bit obvious, but how many Chuck Norrises do I now have?*Teacher Advisor is 100% free.