Okay, we are given 920583708 and 6895134850. Let's add them up step by step.

Step 1: We'll start by adding the digits 8 & 0 in column 1 and get 8.

Step 2: We'll start by adding the digits 0 & 5 in column 2 and get 5.

Step 3: We'll start by adding the digits 7 & 8 in column 3 and get 15.
We'll write down the last digit 5 and carry the 1 to the next column.

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

Step 5: We'll start by adding the digits 8 & 3 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 & 1 in column 6 and get 7.

Step 7: We'll start by adding the digits 0 & 5 in column 7 and get 5.

Step 8: We'll start by adding the digits 2 & 9 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 9 & 8 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, 920583708 + 6895134850 = 7815718558.

