No problem, let's work through this together. We're starting with 1559117028 and 6895888857 and adding them all up.

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

Step 2: We'll start by adding the digits 2 & 5 in column 2 and get 8.

Step 3: We'll start by adding the digits 0 & 8 in column 3 and get 8.

Step 4: We'll start by adding the digits 7 & 8 in column 4 and get 15.
We'll write down the last digit 5 and carry the 1 to the next column.

Step 5: We'll start by adding the digits 1 & 8 in column 5 and get 10.
We'll write down the last digit 0 and carry the 1 to the next column.

Step 6: We'll start by adding the digits 1 & 8 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 & 5 in column 7 and get 15.
We'll write down the last digit 5 and carry the 1 to the next column.

Step 8: We'll start by adding the digits 5 & 9 in column 8 and get 15.
We'll write down the last digit 5 and carry the 1 to the next column.

Step 9: We'll start by adding the digits 5 & 8 in column 9 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

Step 10: We'll start by adding the digits 1 & 6 in column 10 and get 8.

So, 1559117028 + 6895888857 = 8455005885.

