Description: Learn to use regrouping, or carrying to add 536 + 398. Created by Sal Khan. And so when we write it down here in the sum, we could say, well, look, the four is in the ones place, so it's equal to 4 plus one 10 So let's write that one 10 in the tens place. And now we focus on the tens place. Now, we have to remind ourselves, this is 13 tens.*Teacher Advisor is 100% free.