OK, let's do this. We've got 5348550987 and 469260628 and we're adding them all together.

Step 1: We'll start by adding the digits 7 & 8 in column 1 and get 15.
We'll write down the last digit 5 and carry the 1 to the next column.

Step 2: We'll start by adding the digits 8 & 2 in column 2 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

Step 3: We'll start by adding the digits 9 & 6 in column 3 and get 16.
We'll write down the last digit 6 and carry the 1 to the next column.

Step 4: We'll start by adding the digits 0 & 0 in column 4 and get 1.

Step 5: We'll start by adding the digits 5 & 6 in column 5 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

Step 6: We'll start by adding the digits 5 & 2 in column 6 and get 8.

Step 7: We'll start by adding the digits 8 & 9 in column 7 and get 17.
We'll write down the last digit 7 and carry the 1 to the next column.

Step 8: We'll start by adding the digits 4 & 6 in column 8 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

Step 9: We'll start by adding the digits 3 & 4 in column 9 and get 8.

Step 10: We'll start by adding the digits 5 & 0 in column 10 and get 5.

So, 5348550987 + 469260628 = 5817811615.

