We have numbers 939137903 and 6929918933. Let's start adding them together.

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

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

Step 3: We'll start by adding the digits 9 & 9 in column 3 and get 18.
We'll write down the last digit 8 and carry the 1 to the next column.

Step 4: We'll start by adding the digits 7 & 8 in column 4 and get 16.
We'll write down the last digit 6 and carry the 1 to the next column.

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

Step 6: We'll start by adding the digits 1 & 9 in column 6 and get 10.
We'll write down the last digit 0 and carry the 1 to the next column.

Step 7: We'll start by adding the digits 9 & 9 in column 7 and get 19.
We'll write down the last digit 9 and carry the 1 to the next column.

Step 8: We'll start by adding the digits 3 & 2 in column 8 and get 6.

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

Step 10: We'll start by adding the digits 0 & 6 in column 10 and get 7.

So, 939137903 + 6929918933 = 7869056836.

