OK, let's do this. We've got 820337502 and 655577429 and we're adding them all together.

Step 1: We'll start by adding the digits 2 & 9 in column 1 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

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

Step 3: We'll start by adding the digits 5 & 4 in column 3 and get 9.

Step 4: We'll start by adding the digits 7 & 7 in column 4 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

Step 5: We'll start by adding the digits 3 & 7 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 3 & 5 in column 6 and get 9.

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 & 5 in column 8 and get 7.

Step 9: We'll start by adding the digits 8 & 6 in column 9 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

So, 820337502 + 655577429 = 1475914931.

