Let's break this down. We're going to add 9501365370 and 3141025299 together.

Step 1: We'll start by adding the digits 0 & 9 in column 1 and get 9.

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 3 & 2 in column 3 and get 6.

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

Step 5: We'll start by adding the digits 6 & 2 in column 5 and get 9.

Step 6: We'll start by adding the digits 3 & 0 in column 6 and get 3.

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 0 & 4 in column 8 and get 4.

Step 9: We'll start by adding the digits 5 & 1 in column 9 and get 6.

Step 10: We'll start by adding the digits 9 & 3 in column 10 and get 12.
We'll write down the last digit 2 and carry the 1 to the next column.

So, 9501365370 + 3141025299 = 12642390669.

