We are presented with 7472664334 and 173792030. Let's work out the sum.

Step 1: We'll start by adding the digits 4 & 0 in column 1 and get 4.

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

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

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 6 & 9 in column 5 and get 15.
We'll write down the last digit 5 and carry the 1 to the next column.

Step 6: We'll start by adding the digits 6 & 7 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 2 & 3 in column 7 and get 6.

Step 8: We'll start by adding the digits 7 & 7 in column 8 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

Step 9: We'll start by adding the digits 4 & 1 in column 9 and get 6.

Step 10: We'll start by adding the digits 7 & 0 in column 10 and get 7.

So, 7472664334 + 173792030 = 7646456364.

