We have numbers 10354095 and 290702595. Let's start adding them together.

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

Step 2: We'll start by adding the digits 9 & 9 in column 2 and get 19.
We'll write down the last digit 9 and carry the 1 to the next column.

Step 3: We'll start by adding the digits 0 & 5 in column 3 and get 6.

Step 4: We'll start by adding the digits 4 & 2 in column 4 and get 6.

Step 5: We'll start by adding the digits 5 & 0 in column 5 and get 5.

Step 6: We'll start by adding the digits 3 & 7 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 0 & 0 in column 7 and get 1.

Step 8: We'll start by adding the digits 1 & 9 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 0 & 2 in column 9 and get 3.

So, 10354095 + 290702595 = 301056690.

