Not to worry, we've got 8939083877 and 738273910. Let's get to adding them!

Step 1: We'll start by adding the digits 7 & 0 in column 1 and get 7.

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

Step 3: We'll start by adding the digits 8 & 9 in column 3 and get 17.
We'll write down the last digit 7 and carry the 1 to the next column.

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

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

Step 6: We'll start by adding the digits 0 & 2 in column 6 and get 3.

Step 7: We'll start by adding the digits 9 & 8 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 3 & 3 in column 8 and get 7.

Step 9: We'll start by adding the digits 9 & 7 in column 9 and get 16.
We'll write down the last digit 6 and carry the 1 to the next column.

Step 10: We'll start by adding the digits 8 & 0 in column 10 and get 9.

So, 8939083877 + 738273910 = 9677357787.

