Not to worry, we've got 9090020108 and 8913241416. Let's get to adding them!

Step 1: We'll start by adding the digits 8 & 6 in column 1 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

Step 2: We'll start by adding the digits 0 & 1 in column 2 and get 2.

Step 3: We'll start by adding the digits 1 & 4 in column 3 and get 5.

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

Step 5: We'll start by adding the digits 2 & 4 in column 5 and get 6.

Step 6: We'll start by adding the digits 0 & 2 in column 6 and get 2.

Step 7: We'll start by adding the digits 0 & 3 in column 7 and get 3.

Step 8: We'll start by adding the digits 9 & 1 in column 8 and get 10.
We'll write down the last digit 0 and carry the 1 to the next column.

Step 9: We'll start by adding the digits 0 & 9 in column 9 and get 10.
We'll write down the last digit 0 and carry the 1 to the next column.

Step 10: We'll start by adding the digits 9 & 8 in column 10 and get 18.
We'll write down the last digit 8 and carry the 1 to the next column.

So, 9090020108 + 8913241416 = 18003261524.

