No problem, let's work through this together. We're starting with 3791211876 and 9601382523 and adding them all up.

Step 1: We'll start by adding the digits 6 & 3 in column 1 and get 9.

Step 2: We'll start by adding the digits 7 & 2 in column 2 and get 9.

Step 3: We'll start by adding the digits 8 & 5 in column 3 and get 13.
We'll write down the last digit 3 and carry the 1 to the next column.

Step 4: We'll start by adding the digits 1 & 2 in column 4 and get 4.

Step 5: We'll start by adding the digits 1 & 8 in column 5 and get 9.

Step 6: We'll start by adding the digits 2 & 3 in column 6 and get 5.

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

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

Step 9: We'll start by adding the digits 7 & 6 in column 9 and get 13.
We'll write down the last digit 3 and carry the 1 to the next column.

Step 10: We'll start by adding the digits 3 & 9 in column 10 and get 13.
We'll write down the last digit 3 and carry the 1 to the next column.

So, 3791211876 + 9601382523 = 13392594399.

