Not to worry, we've got 476504151 and 9158857198. 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 5 & 9 in column 2 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

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

Step 4: We'll start by adding the digits 4 & 7 in column 4 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

Step 5: We'll start by adding the digits 0 & 5 in column 5 and get 6.

Step 6: We'll start by adding the digits 5 & 8 in column 6 and get 13.
We'll write down the last digit 3 and carry the 1 to the next column.

Step 7: We'll start by adding the digits 6 & 8 in column 7 and get 15.
We'll write down the last digit 5 and carry the 1 to the next column.

Step 8: We'll start by adding the digits 7 & 5 in column 8 and get 13.
We'll write down the last digit 3 and carry the 1 to the next column.

Step 9: We'll start by adding the digits 4 & 1 in column 9 and get 6.

Step 10: We'll start by adding the digits 0 & 9 in column 10 and get 9.

So, 476504151 + 9158857198 = 9635361349.

