Not to worry, we've got 321144813 and 3399069. Let's get to adding them!

Step 1: We'll start by adding the digits 3 & 9 in column 1 and get 12.
We'll write down the last digit 2 and carry the 1 to the next column.

Step 2: We'll start by adding the digits 1 & 6 in column 2 and get 8.

Step 3: We'll start by adding the digits 8 & 0 in column 3 and get 8.

Step 4: We'll start by adding the digits 4 & 9 in column 4 and get 13.
We'll write down the last digit 3 and carry the 1 to the next column.

Step 5: We'll start by adding the digits 4 & 9 in column 5 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

Step 6: We'll start by adding the digits 1 & 3 in column 6 and get 5.

Step 7: We'll start by adding the digits 1 & 3 in column 7 and get 4.

Step 8: We'll start by adding the digits 2 & 0 in column 8 and get 2.

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

So, 321144813 + 3399069 = 324543882.

