Not to worry, we've got 1309450011 and 8080543478. Let's get to adding them!

Step 1: We'll start by adding the digits 1 & 8 in column 1 and get 9.

Step 2: We'll start by adding the digits 1 & 7 in column 2 and get 8.

Step 3: We'll start by adding the digits 0 & 4 in column 3 and get 4.

Step 4: We'll start by adding the digits 0 & 3 in column 4 and get 3.

Step 5: We'll start by adding the digits 5 & 4 in column 5 and get 9.

Step 6: We'll start by adding the digits 4 & 5 in column 6 and get 9.

Step 7: We'll start by adding the digits 9 & 0 in column 7 and get 9.

Step 8: We'll start by adding the digits 0 & 8 in column 8 and get 8.

Step 9: We'll start by adding the digits 3 & 0 in column 9 and get 3.

Step 10: We'll start by adding the digits 1 & 8 in column 10 and get 9.

So, 1309450011 + 8080543478 = 9389993489.

