Alright, let's solve this problem step by step. We have 424 and 347 and we're adding them together.

Step 1: We'll start by adding the digits 4 & 7 in column 1 and get 11.
We'll write down the last digit 1 and carry the 1 to the next column.

Step 2: We'll start by adding the digits 2 & 4 in column 2 and get 7.

Step 3: We'll start by adding the digits 4 & 3 in column 3 and get 7.

So, 424 + 347 = 771.

