Let's solve this addition problem. We have 3590541670 and 411948191, and we need to add them together.

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

Step 2: We'll start by adding the digits 7 & 9 in column 2 and get 16.
We'll write down the last digit 6 and carry the 1 to the next column.

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

Step 4: We'll start by adding the digits 1 & 8 in column 4 and get 9.

Step 5: We'll start by adding the digits 4 & 4 in column 5 and get 8.

Step 6: We'll start by adding the digits 5 & 9 in column 6 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

Step 7: We'll start by adding the digits 0 & 1 in column 7 and get 2.

Step 8: We'll start by adding the digits 9 & 1 in column 8 and get 10.
We'll write down the last digit 0 and carry the 1 to the next column.

Step 9: We'll start by adding the digits 5 & 4 in column 9 and get 10.
We'll write down the last digit 0 and carry the 1 to the next column.

Step 10: We'll start by adding the digits 3 & 0 in column 10 and get 4.

So, 3590541670 + 411948191 = 4002489861.

