So you just saw, we're just doing 7 and 8 digit number additions, but you could apply this-- if I had a number with 100 digits in it, you could do the exact same thing. You just have to start at the right, go each column by each column, and then if you end up with a two-digit answer when you add the two one-digit numbers, you just carry the 10's place. You just doing that and work your way left.